Should flaccid stretches be done in a completely flaccid state only? I always get a little pumped after a few seconds into a stretch. Is that less than optimal?
Yes, try to perform flaccid stretches in the phrase’s description’s recommendation: flaccid.
I find that I’ll plump up during flaccid stretches when my grip slides too close to the glans. If this starts happening, I simple grip tighter or lower (towards the base). Another thing you can try is baby powder or similar grip enhancement. Check out these gloves recommended by Wadzilla.