I know landing back seat is a main cause but what else can you do to eliminate the problem. My boots are technica agent 90s and i like them but recently they have been hurting. do booster straps work? any other ideas?
first step: get good footbeds. then make sure to eliminate any gaps between your shin and the tongue either through Booster straps or padding. have your boot-fitter make sure the boot is correct stiffness for you as well (he can soften or stiffen it so it is correct)
-Make sure there is no gap between your shin and the tongue
-Make sure your feet don't move at all in the boots.
-DON'T SKI/LAND BACKSEAT
-Booster Straps can help eliminate the gap between your shin and the tongue
-Get foot beds, they help keep your foot locked down in the boot.
Basicely what it all comes down to is avoiding any movement within the boot, and not landing/skiing back seat.
2bi4 is lightyears ahead of 4bi9, whens the last you saw someone build a house using 4bi9s? -jfletcher
make sure the booster strap on the boot (the top velcro strap that is already there) is done up inside the plastic shell. it should tighten the liner as much as possible. you can then do up the buckles on the outside of it. that'll generate a much better fit around your calf.
this is what we do with our Dual Strap- a 55mm strap is split horizontally so the top half catches the liner, the lower half catches the shell. Half of our racers use that, the other half use a single cam strap on their tongue. Give it a try, it works really well.