i've been messing with the lower leg ridge too, and it does seem to be intrinsic to end gathered hammocks and also to laying diagonal. probably more noticable the more diagonal you get.
i find having little force on the rl lessens it, but the reason it was never a problem for me is because i use the same setup: leg pad and knee-sac combo, and it does get rid of 100% of the problem. i don't notice the knee ridge much or if at all with just the leg pad, but the added comfort of the knee-sac is substantial imo. i feel the knee sac really goes a long way toward insulating my legs as well.