You may just have a really weird boot fitting problem too. I had a pair of Head mojo boots last year, they fit me perfect, tight like a race boot. I still got MASSIVE shin bang, even from just skiing groomers all day. I tried boosters, softening the flex, footbeds. I tried out my brothers SPK's and while they did not have near as good of a fit, my shin bang problem was reduced substantially.
With the heads it was almost impossible to ski aggressively for two days in a row, with my SPK's I can go like 5 days before it starts to really hurt, but then again I avoid doing tricks that give me bad shin bang.
Also, refer to shin bang as "bootleg fireworks," thats right I'm starting the trend right now.