I had a similar problem last year, compounded by the fact that I run the zone. I tried to play as much of a minus as I could, if the other team didn't shoot a lot of three's I would be at least a minus 2, if they really pounded the paint anyway I'd dip it even farther. Of course fouling was another problem, which made my rebounding even worse because part of the problem was my lack of rebounding depth. However if your team is really superior in Ath/Sp/Def than you may be able to get away with playing a bigger minus than I was able to.
All the extra shots I gave up really killed me so I would also just be wise with your distribution so you're scoring efficiently, and do your best to improve your teams ability to not turn the ball over, even if it means playing guys who have better ball handling and passing if you have to sacrifice some other ratings (obviously in moderation).