I have dived exclusively on FRC for at least three years now and I too have felt that squeeze on a number of occasions, a few times I pushed it a bit hard and coughed up blood although I have not had that happen for quite some time, I used to get that under inhale diving anyway. My experience has taught me that adapting to depth takes longer under FRC but it does happen and it can differ from day to day. If I have had an extended break from diving my depth might be pulled back for this reason, although I have spearfished down to 27 metres on FRC, usually I am around 15 - 20 metres which gives me no strain anymore at all, I simply don't notice it. Around 22 - 23 I can feel it sometimes but it becomes less noticable over time, I believe it helps to make a slow inactive descent. I just love FRC diving so much so that I have not inhaled for many years and probably never will again.
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