I fall on my face. If I lean the upper body backwards I can almost keep the balance (but I guess that doesn't count ;) ). The Garmont Radium have only one forward lean position. The external mechanism looks like it could be replaced, but I don't think they offer replacements with other lean options.
Adding ramp inside the boot in the toe area is out of the question, there's already little room there.
I use Dynafit Vertical ST, which adds more forward lean (heel 10 mm higher than toe). I did the tests on flat ground with boots only. On the ski it will be even worse.
I guess my best option will be to shim up the Dynafit toe piece?
I am surprised that touring boots add too much forward lean, aren't they in general less aggressive than alpine boots?
When I bend the knees slightly, the weight is on the ball of the foot. When I bend a bit more, the weight is evenly distributed across the foot.
The heel drops a little bit.
I didn't do the rest of the tests. However, when my binding adds 10 mm rise in the heel, I am not sure they will be so relevant to do with boots only. I guess I should make an inclined board to simulate the added lean, and do the tests on that.