The rebounding problem with this team is not so much with the PFs, its with the center position and the SF and SG position. The SGs and SFs defensive rebounding has been worse than atrocious and with KG playing center, whenever he isn't in the game the center position is getting killed.
Get a center that rebounds. Not a PF like Evans. He isn't going to rebound any better than Wilcox or Bass against real life centers and rebounding PFs.