BTW when you do practice sets, how are you predominantly returning backhands? Are you mostly practicing on clay?
This season we're on grass and i've switched to slicing all my backhand returns, it works really well so far. Its a bit harder on hardcourt though i find when the ball sits up more. But I find on the grass the ball is so quick and skids so low, its near impossible to time a good one hander. So the best option is a block anyway, weather thats a more neutral block or a slice block doesn't really seem to matter.. but the slice block requires no grip change.