Inner spring retainers

I've raised the front using Calmini shackle extenders and I thought I'd get maximum effect by extending the inners by the same amount. I'm spring under and wont be changing but need to lift the body away from the 31's I'm planning to fit. I can't see any problem with this fix. I've searched for negatives but this seems to be an easy way of getting more body lift. any comments?