Hi,
I wear my boots looser and looser the more I ski the park. I used to get shin-bang with older boots that were higher on my leg and stiffer. I ski on classic FT boots, because I have narrow feet. Even these are too wide for me. Now, I've got FT tongue No. 6, and those are almost too stiff. I might go to the 4. I would try not tightening, but loosening your power straps and upper buckle. The better you ski, the looser you can make it. Your shin-bang is probably because your ankle can't flex--and you're trying to flex it in your boot, but your boot won't allow it. So, loosen your upper buckles to let your ankle flex. Keep the lower buckles tighter so your foot doesn't move. I'd give the back of the boot as much forward flex as you can, also. Literally anymore, if I tighten my ski boots upper buckles and power straps, I can't do rails very well. My 'pop' suffers and I can't scissor on the rails. As soon as I loosen them, everything gets easier. You're fighting your ski boots and any gel or softer liner isn't the problem. The 8 tongue is too stiff, but you can still loosen your boots by undoing your upper buckles to see how it feels. Give it a try. I once saw a good park skier who didn't buckle his ski boots at all. They were totally loose. The idea that the stiffer your ski boots are the better skier you are is a fallacy. I can undo my buckles all the way and ski down the steepest mogul field no problem. Remember something else--racers use the stiffest boots. They buckle them down a few minutes before a run, and the first thing they do after a race is unbuckle their boots because their feet are killing them.