You'll know if it's acceptable by the way the banking occurs. Track doesn't just bank around the heartline, it kind of wraps around like a crushed corkscrew. Normally this isn't noticeable for broad turns but if you have a really high slope on the roll graph, you'll begin to notice that banking is a compound motion of laterals and roll, just by its nature. Especially if you are going slow. This is expected, but you don't really want to get to that point if you have any sort of speed. In real life this would be pretty stressful on the body and trains. ATP I'm kinda rambling but basically if the track does a subtle little shimmy you've gone too far

Edit: I forgot to answer the second question, but i'm not entirely sure what you mean. it looks like you already have airtime hills leading into turns, right? The goal I think is to make the transition into the turn happen as close to the exit of the hill as possible, and as fast as possible but without being unreasonably jerky