I have no experience with the brands of mouthpieces that you are talking about here. However, I use Oceanic moldable mouthpieces (on my primary, my backup and my stages/deoc bottles) because they look just like a regular mouthpiece, are the same size, but they use moldable bite tabs (heat in water, bite, then they retain that shape thereafter). Using them allows me to pretty much completely close my jaws, causing me absolutely no jaw fatigue even on dives that last for hours.
In the event that you donate to a buddy with your primary regulator on the long hose, the worst case scenario is that your buddy will not be able to close his/her jaws completely, but in any event no worse than using a stock mouthpiece in the first place. I have done tons of air sharing drills this way with divers all the time. None have even noticed that I am using a none standard mouthpiece.
I would strongly suggest going with a mouthpiece change rather than re-configuring your gear. Check out the Oceanics before making such radical changes.
In the event that you donate to a buddy with your primary regulator on the long hose, the worst case scenario is that your buddy will not be able to close his/her jaws completely, but in any event no worse than using a stock mouthpiece in the first place. I have done tons of air sharing drills this way with divers all the time. None have even noticed that I am using a none standard mouthpiece.
I would strongly suggest going with a mouthpiece change rather than re-configuring your gear. Check out the Oceanics before making such radical changes.
