I agree totally with what you said, rebounding slider adjustments cant really fix the issue, its a mechanical issue, that the devs have to fix. Ive been messing around, with sliders trying to fix this, and havent found a good solution really.
If you lower rebound sliders, all that does is lower rebounding for all players, so that dont fix the issue of C and PF still pulling down a ton of rebounds every game you play.
1 thing I have found that, may help some, is lowering hands sliders. Typically your bigs have the worst hands, so lowering it I think helps some. It also helps to get turnovers up, since they are too low, especially non steal turnovers.
I need more time to test, but seems lowering hands, might actually be causing more blocked shots for some reason, in past yrs, this never seem to be the case in the past, when lowering hands slider, as I always had to raise blocks slider in past yrs, when lowering hands, so might actually need to lower shot block slider when lowering hands, but I need to test more 1st before knowing for sure.
I do think editing player rebounding skills, probably would help atleast some, but not sure it would fix it, as I do believe its a flaw the devs need to fix, but I could be wrong. I do know some guys have better rebounding grades than they should. For instance I always use the Pacers, and Im always grabbing a lot of rebounds each game with Miles Turner, and he isnt a very good rebounder IRL for his size, just yet anyway, but NBA2k rating is too high.
Whoever does the ratings for NBA2k, does a crappy job, whether it be inflating overalls, or inflating certain attributes, they are just very poor. So while im not sure if rebounding could be fixed with editing, I do think you could probably improve it quite a bit with a rerate of rebounding for all players. It seems every game I have played with the Pacers Im constantly grabbing 14+ rebounds per game with Miles Turner.