I prefer to retract the foreskin halfway over the glans while stretching my penis out and wrapping, and smoothing excessive skin towards the base for each turn of wrap.
When I let go of the stretch and things settle, the wrap usually is right behind or slightly in front of my glans. Foreskin covers the head completely, but not excessively.
You still have to stretch skin in certain positions.
I`m doing straight out at the moment and I experience close to zero skin strech. This has forced me to perfect my hanging technique.
Hanging BTC involves more skin stretch and more slack in terms of attachment, because the skin is taking much of ths stretch. Credit to Piet for pointing this out.
I have found that I actually have to attach the hanger closer to the head than what I did in the past. No matter how far back I attach the hanger, it slides forward even though I tight superhard. The reason for attaching it closer to the base was that I was afraid of too much pressure on the head. This logic is however flawed in my experience.
The solution is to attach the hanger about an inch from the head, tighten so that the penis is properly positioned, then lightly pull the hanger forward. Then you may experience that the hanger slides forward on the inner structures and settle so to speak. At this point I tighten as hard as I can. Top gap nearly closed.
The only disadvantage I can think of with uncut hanging, is that with many sets one may experience fluid-buildup in the foreskin that may be experienced as a burning sensation at the end of sets. The solution to that could be shortening the sets to 10-15 minutes at the end of the day.