Yeah, different releases have different paybacks. I haven't seen anything over 100% on the AVP loaders I have either. Quite a few of my 044 poker games can be set over 100%. With the 3902 software the base chip determined the paytables and there are several different ones for the different GK packages. The biggest difference between them is the paytables, but some also enable different games. Bottom line is your stuck with whatever the software allows.
When I lived in Vegas (1995-2000) most of the locals (think station casinos) casinos had video poker machines over 100%. Most people don't play statistically correct anyhow, so they get back more because of that. They used to also count for points on your player's card, sometimes 3x/5x points if you went on certain slow days. My favorite was 10/7 Double bonus poker.