I have struggled with shinbang for a while, always had boots that fit well, booster straps etc, but every now and again, I would always land backseat and be fucked.
This year in NZ I got new boots that had a rear 'spoiler', like a bit of plastic on back of the liner. I thought that maybe if I move that higher, it would give me more support when I do land backsseat, and it worked. So if you are hurting, have tried everything else, and have a spoiler, move it higher!