"I know the problem. Never had pain. But Limited dorsiflexion. It sucks.
A more upright boot helps. As does a stiffer boot if you want to push the tongue.
Also heel lift. Opens the ankle.
Also ramp angle on bindings is huge. Or delta. Or whatever you call it.
Having your toe binding lower is a negative. Flat delta is better for us misfit skiers."
Binding Delta and boot forward lean/ramp address two different things. The first addresses the foot and ankle while outside the boot( binding delta/canting) address biomechanics above the ankle.
If you have limited ankle range and if when you stretch your calf with your knee locked and don't feel it in your calf, get your ankles mobilized by a chiropractor.
Binding delta is really hard to get solid information on, but it is related to tibia vs femur length, and/or torso to leg length variances.
Long femur to tibias do better with higher delta, and long tibia to femur do better with flat deltas to negative.