The best days of 15W seem to be in the past. It was one of my first-ever received satellites from Nova Scotia. I used to receive MSNBC and exotic tps including from TVGE from Equatorial Guinea (now on 97W).
The lowest I've seen in past was 12 degrees elevation. I could reliably receive 3W using my USALS motor mounted near ground level.
Pointing at 3W (12 degrees elevation):
View attachment 166330
For 3 degrees elevation, if possible, I think you must go inverted. Going inverted makes the physical mount issues disappear. I've heard ground noise may be an issue when pointing that low of an elevation.
Pointing at 14 degrees elevation:
View attachment 166331
When I last received 15W last year, VOA was about the only regular tp in low band. I could receive while motoring past to 3W. There were some radio channels also on 15W. The VOA tp is only 2.7 C/N lock so it is quite easy to receive.
On 22W, I used the following references as my data tp beacons so I knew where I was looking in the sky. The bolded one was the best (24/7):
12080 H 10332 5/6 DVB-S2 8PSK
12089 H 4720 9/10 DVB-S2 8PSK
12180 H 5423 AUTO DVB-S2 QPSK
ADDED:
For an inverted dish, the actual angle of elevation = physical dish elevation - dish offset. So when the dish is at right angle to the ground (beaming parallel to the ground), it's actually pointing at -22 degrees elevation for my 1m dish. For 3 degrees elevation, if your dish offset is 22 degrees, then you need to physically point the dish at +25 degrees.