I always strech after. I feel the same way DLD. It seems to really help the gains. You already have the blood flow, & it seems for me, that I strech harder.
you know, I've been doing something like that for awhile now. I have made some really nice gains.
What I do is;
1) grip behind the head and pull out.
2) then grip behind my balls (you should feel more of your penis) under your tant. I pull that out as much as I can.
3) so you are using...