On your 7900, you need to toggle the ENC, DEC, ENC DEC, settings until you find the one that works, then save it. I think it's just ENC that works on the 145.310, but I have struggled with that as well. And I too can't get the Baofeng to connect with the 145.310 reliably, in fact it has only worked once for me. I have been meaning to try an external antenna just to see if it helps, but I think the problem lies within the programming software & programmer. The 145.145 should work flawlessly though, can you hit that one?
82 fj40, 99 uzj100, 06 gx470
97 DR650, 05 525EXC, 01 XT225, 89 TW200, 09 TTR125, 07 TTR90, 07 CRF50