Steve,
Another technique you way want to try whilst getting used to the "crushed" feeling is one that (I believe) Eric Fattah uses for constant.....
When you get to just before residual volume (for you you say 50m). Fill your mouth with air (think of it as a separate unit from your lungs) and close your airway (i.e. don't try and pull any more air up from your lungs)
Then equalize using just the air in your mouth.....I tried this at dolphin, and could go MUCH deeper on empty lung dives than I had done before....
It'll get you deeper definitely, how much i'm not sure, but it's got to be a good thing while you get your ribcage flexible.....and as for stretching your diaphragm.....have you tried the yogic exercises you see people doing (exhale completely and then push your stomach muscles out - can't remember the name now)
Hope this helps...
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