Interesting idea, but I’m slightly confused, I’ve not seen this before and not tried it: If the support rests against the chin, doesn’t the action of adding pressure from the instrument force the lower jaw backwards, even if slightly. Whilst this doesn’t stop the lower lip from being able to hold its position (or advance) the logical impact would be to move the lower lip back and hence increase overbite, wouldn’t it?
Also, a few years ago when I realised that excess pressure was a real problem – for me – I tried to move the instrument slightly away during some simple exercises (i.e. very slight contact only with mouthpiece) and found that whilst there were strength benefits the tone of my overall sound when playing normally deteriorated. This my have been very temporary but I reduced and then stopped this approach. Just wonder if that has been seen when trying the Stratos?