On my Meg I have a BOV with a drager gag strap. That mouthpiece makes my gag something fierce out of the water. Its a huge challenge to make it through a pre-breath without gagging. Shockingly, in water its super comfy, have you tried one? I typically run a little higher than min loop for the same reason, I notice the accumulation of minor low volume insults (ADV off) over multi hour dives.Sometimes well into a dive (2 hours+) I find my soft palate getting tired and start unintentionally exhaling through nose. I have been told that this is not uncommon with rebreathers which always have some exhale WOB. Flexing neck , trimming head down and increasing loop volume helps without need to bail out.
Could it be the same phenomenon (palate fatigue due to increased wob and mouth breathing) instead of a real laryngospasm?
@doctormike probably knows this stuff.