You do not need new fins to replace the Sea Wing Novas for the diving that you describe. Quattros would be slightly more negative, if you just want new fins. N
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This can contribute to your issue if you are using a standard aluminum cylinder which is most rentals. A standard aluminum cylinder will get light in in the bottom as air is used up so by moving it down it's going to want to float your feet. If you are good of air try a 63 instead on an 80 which my fit you better and not have it so low. Also good choice on the fins the Avanti's are my favorite fin and what I use. I have the Nova's among others and always come back to the Avanti's.Because I'm short (5' 1") I've always had my tank low so my head doesn't bump into the first stage. My top cam band is generally as high as it can get without slipping off. Sometimes it's a close call, making my buddy uncomfortable, but if it rides higher my head bumps.