RE: roll & turn
Not all planes respond the same. Some have more powerful rudders than others. Watch your plane carefully to see if the tail is following the nose or if its skidding/sliding.
As you bank into the turn your wing loses some of its lift and some of the elevator effect is directed towards the turn instead of just pointing the nose up. So in a turn you may need to apply a little power and/or up elevator to maintain altitude.
Regards,
Clay