So much this. Damn, nice work Tom.
Also make sure your lowest ankle buckle is fully tightened and it's keeping your heel in the heel cup. If it's a notch too loose it'll let your ankle move forward under pressure. If your ankle shape doesn't jive with your lower buckle and it's leaving a space, tell your bootfitter when he's making your footbeds, maybe he can also shim your tongue to keep your foot locked in.
I also have problems with toe bang because of my ridic morten's toe (fwiw that means your second toe sticks out further than your big toe). Before I had it punched properly it was excruciating even though the rest of the boot fit well. If this is part of your problem, either look into having it punched/ground- again, by your bootfitter- or look at dalbellos in the future.
"I know you believe you understand what you think I said, but I am not sure you realize that what you heard is not what I meant."- Alan Greenspan