that tendon fires for some people when it is overflexed and or if there is some instability in the foot that that causes your foot to adapt to gain grip the snow. perhaps that is why the pain/pressure is cyclical.
ask yourself the question - what effect on the tendon firing does changing the equation of ramp angle and forward lean have? you said that you put the FL lean wedge in...why? what problem were you attempting to solve with the FL wedge?
see if you can figure out what action, either dorsi flexion or plantar flexion causes the tendon to pop out?
reducing the movement that gets the tendon to pop should be the priority. then transfer that knowledge to the ramp angle/forward learn formula to keep that tending stable while skiing.
if all that fails, you can always try to root around in there and cut or grind on the tongue/liner or add padding to the tongue to float the tendon in a channel that spreads out the load. but as earlier stated i strongly recommend that you quite down the source versus treating the symptom. as an aside figuring out the ramp/FL position will carry a side benefit of improving your stance and balance as well as getting rid of the pain.