Hi Rob
This sounds like the gyro is running slow or binding, has the gyro been replaced or overhauled at any time?
Adjusting the roll gain is a can only be done with a test rig or a break out box.
Try taking the gyro out and with it connected run the autopilot and bank the gyro left and right and see how sensetive the autopilot is to the movement of the gyro, it should be quite sensetive.
Or the bank angle adjustment is out, again needs a break out box to set it up.
Let me know how you get on.
Regards
Pete
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