Further to my note above, I see from our past communication the following record regarding C-band reception from the far eastern sats:
22.0W:
TV Cidade (3 channels)
3.0W:
5 TV channels including TV Verdes Campos, TV Almg, TV Alerj, RBCTV, IMPD BH
Ok I played a bit more with it today. Got the same results as last week on 14W, still no 11W, but I was able to get everything that I expected on 22W, and some detection on 18W:
on 22W, this is the scan result on the MIO4K:
< 'DVB-S 3970L / 3333 / AUTO' > Tp# 1
< (1)Program 1 /> 1:0:1:1:1:1

320F82:0:0:0:
< 'DVB-S2 8PSK 4015L / 5983 / 3/5 MIS 0' > Tp# 2
< (2)TV Cidade 1Seg /> 1:0:C0:3578:1AB:1AB

320FAF:0:0:0:
< (3)TV Cidade HD /> 1:0:1:3560:1AB:1AB

320FAF:0:0:0:
< (4)AUDIO 1 by AUDIO 1 /> 1:0:1:3561:1AB:1AB

320FAF:0:0:0:
< 'DVB-S2 8PSK 4021L / 3200 / 3/4' > Tp# 3
< (5)TV Leste HD /> 1:0:1:3:1:1

320FB5:0:0:0:
< 'DVB-S2 8PSK 4026L / 5000 / 2/3' > Tp# 4
< (6)TV Asa Branca HD /> 1:0:1:BCE0:5E7:B23A

320FBA:0:0:0:
< (7)TOP MUSIC (Radio #1) /> 1:0:2:BCFA:5E7:B23A

320FBA:0:0:0:
< 'DVB-S 4034L / 2963 / AUTO' > Tp# 5
< (8)Prog.01 /> 1:0:1:1:B1:EC

320FC2:0:0:0:
< 'DVB-S2 QPSK 4044R / 2500 / 2/3' > Tp# 6
< (9)Radio 20 (Radio #2) /> 1:0:2:14:2:FFFF

328FCC:0:0:0:
< (10)Radio 19 (Radio #3) /> 1:0:2:13:2:FFFF

328FCC:0:0:0:
< (11)Radio 18 (Radio #4) /> 1:0:2:12:2:FFFF

328FCC:0:0:0:
< (12)Radio 17 (Radio #5) /> 1:0:2:11:2:FFFF

328FCC:0:0:0:
< (13)Radio 16 (Radio #6) /> 1:0:2:10:2:FFFF

328FCC:0:0:0:
< (14)Radio 15 (Radio #7) /> 1:0:2:F:2:FFFF

328FCC:0:0:0:
< (15)XANGRI-LA (Radio #8) /> 1:0:2:E:2:FFFF

328FCC:0:0:0:
< (16)TRAMANDAI (Radio #9) /> 1:0:2

:2:FFFF

328FCC:0:0:0:
< (17)TORRES (Radio #10) /> 1:0:2:C:2:FFFF

328FCC:0:0:0:
< (18)PAMPA (Radio #11) /> 1:0:2:B:2:FFFF

328FCC:0:0:0:
< (19)LIBERDADE (Radio #12) /> 1:0:2:A:2:FFFF

328FCC:0:0:0:
< (20)IMBE (Radio #13) /> 1:0:2:9:2:FFFF

328FCC:0:0:0:
< (21)GRENAL (Radio #14) /> 1:0:2:8:2:FFFF

328FCC:0:0:0:
< (22)ELDORADO FM (Radio #15) /> 1:0:2:7:2:FFFF

328FCC:0:0:0:
< (23)ELDORADO AM (Radio #16) /> 1:0:2:6:2:FFFF

328FCC:0:0:0:
< (24)CONTINENTAL (Radio #17) /> 1:0:2:5:2:FFFF

328FCC:0:0:0:
< (25)CIDREIRA (Radio #18) /> 1:0:2:4:2:FFFF

328FCC:0:0:0:
< (26)CAPAO (Radio #19) /> 1:0:2:3:2:FFFF

328FCC:0:0:0:
< (27)CAICARA (Radio #20) /> 1:0:2:2:2:FFFF

328FCC:0:0:0:
< (28)104 (Radio #21) /> 1:0:2:1:2:FFFF

328FCC:0:0:0:
< 'DVB-S2 QPSK 4048R / 3750 / 3/4' > Tp# 7
< (29)TV Tambau HD /> 1:0:19:1:1:1

328FD0:0:0:0:
< 'DVB-S2 QPSK 4058L / 5000 / 5/6' > Tp# 8
< (30)CD VERDEHD /> 1:0:1:1:B1:B1

320FDA:0:0:0:
< (31)CD VERDE1S /> 1:0:1:2:B1:B1

320FDA:0:0:0:
< (32)CD VERDEFM (Radio #22) /> 1:0:2:3:B1:B1

320FDA:0:0:0:
< (33)CD VERDESD /> 1:0:1:4:B1:B1

320FDA:0:0:0:
< 'DVB-S2 QPSK 4063R / 6444 / 5/6' > Tp# 9
< (34)TV PAMPA HD /> 1:0:1:CBC0:65E:65E

328FDF:0:0:0:
< (35)TV PAMPA 1seg /> 1:0:C0:CBD8:65E:65E

328FDF:0:0:0:
< 'DVB-S2 8PSK 4063L / 3958 / 3/4' > Tp# 10
< (36)TV Antena 10 1Seg /> 1:0:C0:A938:549:549

320FDF:0:0:0:
< (37)TV Antena 10 HD /> 1:0:1:A920:549:549

320FDF:0:0:0:
< (38)Educa Piauí /> 1:0:1:A921:549:549

320FDF:0:0:0:
< 'DVB-S2 8PSK 4069L / 4996 / 3/4' > Tp# 11
< (39)TV TROPICAL 1SEG /> 1:0:C0:C378:61B:61B

320FE5:0:0:0:
< (40)TV TROPICAL HD /> 1:0:1:C360:61B:61B

320FE5:0:0:0:
< 'DVB-S2 QPSK 4075R / 2500 / 2/3' > Tp# 12
< (41)RBR-SAT /> 1:0:1:1:1:1

328FEB:0:0:0:
< (42)PLUS FM /> 1:0:1:2:1:1

328FEB:0:0:0:
< (43)LIDERANCA /> 1:0:1:3:1:1

328FEB:0:0:0:
< (44)BOA FM /> 1:0:1:4:1:1

328FEB:0:0:0:
< (45)MIX FM /> 1:0:1:5:1:1

328FEB:0:0:0:
< (46)RADIO BSD /> 1:0:1:6:1:1

328FEB:0:0:0:
< (47)Setup Tone /> 1:0:1:7:1:1

328FEB:0:0:0:
< (48)FELIZ FM /> 1:0:1:8:1:1

328FEB:0:0:0:
< (49)MN FM /> 1:0:1:9:1:1

328FEB:0:0:0:
< 'DVB-S2 8PSK 4075L / 5417 / 2/3' > Tp# 13
< (50)TV CORREIO 1SEG /> 1:0:C0:9F58:4FA:4FA

320FEB:0:0:0:
< (51)TV CORREIO HD /> 1:0:1:9F40:4FA:4FA

320FEB:0:0:0:
< 'DVB-S 4165R / 2170 / AUTO' > Tp# 14
another scan also detected
< 'DVB-S2 QPSK 3854L / 18095 / AUTO' > Tp# 1
< 'DVB-S2 16APSK 3915L / 19048 / AUTO' > Tp# 2
and using the "signal finder i got this:
< 'DVB-S 4138R / 2170 / AUTO' > Tp# 1
< (1)Encompass - WES (Radio #1) /> 1:0:2:1:1:1

32902A:0:0:0:<
I got around 9.4dB on most of the channels above, pretty decent for a 6ft dish. The last one (Encompass - WES) is on global beam and I got it with 2.9dB. Good thing it's DVB-S with 1/2 FEC!. It played some nice instrumental music.
the Amiko receiver additionally picked up TV Verdade - O Caminho Antigo at 3974 L 3200
Then I turned to 18W, with very limited expectations. Most channels on that sat are on beams that cover Europe, Africa or Latin America. Only listed TV service that covers this area is on Global beam, with EIRP of about 35dB here in the NorthEast. And that TP uses 8psk 3/4, so it needs 7.9dB to lock.
The MIO4K detected absolutely nothing there. Then I thought of trying with the Amiko miniHDre. While the MIO4K is way more capable than the Amiko, the Amiko has a very nice feature. It displays very weak transponders, even if it can't lock on them. Very nice for "sniffing" weak signals. and on 18W it found the following:
4112 R 2100
4115 R 3496 (listed as data on portalbsd.com.br)
4127 L 1267 (listed as feeds on KingofSats.net)
4130 L 2060 (listed as carrying ORTM 1 and 2 on Lyngsat and others)
4172 L 32818 (listed as data transponder on portalbsd.com.br)
unfortunately I was not able to lock on any of them, but the spectrum viewed in SDRsharp seems to show 4130 at about 6dB.
Next time I will check if there's still anything on 27.5W, and see if I can find a spot in the yard that has LOS to 8W