My 2 cents worth is worth about that, but I'll go ahead and say that the MiG-23 series has a very direct flightpath with very little slide to a turn. It's roll rate in real life isn't incredibly fast, yet it is a MiG. It wouldn't surprise me if an actual MiG-23 had a crisp roll-rate. I know the MiG-17, and the MiG-21 have a pretty good one, the MiG-23 should have one too. Granted, in simulator or in real life, a MiG-23 doesn't have Su-37 capabilites, obviously. If I could see some 'footage' of what your MiG-23 is doing, maybe I can justify it's roll-rate to be too much or too little.