we have identical setups, damn near, lol.
fortec mercury II, sg2100, 1m winegard, invacom qph-031
skywalker-1 with access to the same dish/lnb
and guess what ? I have the same issue. lol.
fortec usually seems to scan the symbol rates in a little high. the skywalker is incredibly fussy, on high symbol rates like 30000 you usually need to be within 10 to get a lock, with low symbolrates like anything under 3000 you need to be withing 2 to get a lock, sometimes tighter if the fec isnt hot.
my dreambox's are fussier then the fortec for symbol rates, but no where near as fussy as the skywalker.
your probably not going to like my solution, but it works 100%, its acurate to within 1Ks/s its amazing.
and it didnt cost me a dime, because I had all the hardware allready, now I dont imagine most people would have it all, but you might get lucky like me.
I had read about this technique before on satforums but there wasnt alot of details, goign from post to post to post I finnaly figured it all out, so Im not taking credit for this, some other smart dude figured it out before me.
basically someone figured out that if you take an analog ird (like my toshiba trx-2220) and attach the baseband output to the ant input on a shortwave radio (I use my icom pcr-2500) and start scanning, for some reason behond my knowlage, you;ll get a lock on a freq that just happens to be the symbol rate of the dvb signal your tuned to on the analog ird.
I know it sounds rediculous, your tuning a freq with an analog ird, to determine the symbol rate of a digital signal. but it works. with amazing acuracy.
there are two things you need in the analog ird, baseband output, not all do. and the ability to manually tune a freq. My toshiba trx-2220 has a baseband output and is really easy to tune any freq I want, some irds you have to go into a diagnostic mode and enter the freq in hex, not fun.
and you need a shortwave receiver, obv its gota have a digital display and be acurate on its tuning, if it tunes a few khz high then its not going to help you is it. hehe.
if you want more info just ask, Id be more then willing to give you a hand, this symbol rate issue was a real pia untill I got this setup running.