The most comfortable bindings I've ever had I got just before this season, Ride El Hefe's and Flow NXT-ATSE's. I was skeptical of all rear entry but these were great they felt loose even though they were actually very tight and the responsiveness which I was most concerned about was taking everything I threw at it great. The El Hefe felt tighter on my foot and rode a lot more responsive, but was not quite as smooth fitting, but was still very comfy for how tight they were and the wedgie system on the El Hefe's comes with a pad that has a 5 degree cant if that is something you think might help.
When I was in the Army I knew a man who had 3 rules about sex, one of them was "quantity not quality". I really regret not asking him what 200 pound twins would classify as.