Rafal, comparing with your video of flexing a Deeluxe track 335, how far goes your old raichle's forward flex? On mine, I'm not flexing that much.
The 1st time I read about your mod on old raichle boots, I was already in the ski resort with no tool, so I only unlocked the lower fastener (2nd from the top, right?). I could get some more flex but not as much as that of track 325.

Fefe