I used to go in with an erection but for me it was just too intense. As you lose your erection it seems the pressure builds pretty high and I would get the blood pooling you’re talking about and would have red spots all over my shaft for days. Kind of looked like lobster meat or something.
I now go in semi-erect and spend a minute or two building up pressure using a make shift strap (made out of a shoe string with two slip knots) to keep the BM in place until I’ve built enough suction for it to hang on with no strap. I also pull it off every five minutes or so and massage my shaft to disperse any blood pooling, then go back in for another five minutes while building up pressure a little quicker second time.
This technique seems to have greatly reduced the “lobster meat” affect and I still feel I’m getting good girth gains. I always put on my extender (size genetics is the one I use) after a BM session and leave it on for 4 hours, take an hour break then back on for 4 more hours.
I’m anxious to see my results over the next 6 months or so with this approach and will definitely post back when I measure again. I only measure once a month at the most but I have been creeping up the BM scale for what that’s worth.
Good luck man.