Uncut men + vacuum chamber traction devices: how you prevent foreskin stretching?

Wondering if someone else is in same predicament.

I’m uncut with a penis that looks like ant eater.

Before using Penimaster Pro vacuum chamber traction device I make sure to pull foreskin back and have glans only sucked in the chamber.

Not to stretch the foreskin I sometimes even don’t engorge glans fully in chamber, only partly.

But guess what - if I do this I get pressure edema STILL on the FORESKIN (frenulum specifically).

I just can’t manage to manipulate glans inside the chamber so no foreskin gets sucked in.

Any advice or tips?

something similar to this, keeps your skin in place and focus suction traction forces in the glans