InVeritate, thank you for your reply.
I am monitoring prostate, PSA and hormonal status since several years. I posted some recent results (also using supplementation & tamsulosin for BPH)
HERE. Also DRE, prostate volume etc .. all look fine. I am due to a second check in few weeks time where I will visit after voiding at home (not to suffer the stress of the clinical setting). I was never tested using a catheter and both urologists used ultrasound. There is ample literature of ultrasound test variability but I suspect my variation is too large to be explained that way.
While the simplest explication is BPH, hence a prostate conditions, I always wondered about the bladder itself, neurotransmitter levels, tone etc.. and your comment on bladder flaccidity points in that direction.
I normally take ~1.5L/d liquid (also due to a past ~25+ years kidney stone event) and might have (naive point maybe) "deconditioned" the bladder by drinking too much.
Kegel was discouraged, as well as a cytoscopy, when I asked some time ago as not really effective but will ask again!