[fflupo]

i m doing FRC / active exhales now since more than 3 years, and i haven t discovered any disadvantage beside safety dives, it requires a clean equalization technic and it gives a sensation i can not explain in words, the movement of the blood out of the limbs and the free-fall down together with the full control of epiglottis etc. is outstanding

i had the same discomfort feeling of lower-side of chest and in the solar-plexus area, as well as i mostly get, especially after deeper FRC (30+)/ empty(15+) dives i need to crack my spin back into place

since more than a year i do an asana session after diving and it is getting much better.

on a max passive exhale dive i although take a gulp of air on top just to have this feeling of breathing in ( at least a bit) but i think it is more of a mind game

i work a lot with my survival shock, together with the passive exhale i let cold water coming up in my suit and the DR kicks in even stronger

for beginners and newbies i recommend to start slowly and take lots of time to adopt the body to the pressure and sensation and supervision

:-)
gravity sucks