Questions about Overhand Jelqing technique

Hello guys, I have been doing PE for around 6 months ,

I did not really measure it so I do not really know of significant gains yet

Recently I have been switching to overhand Jelqing technique and looking to start clamping

When I do overhand Jelq I put more pressure to the sides of the tunica (technically shaped like the usual clamps cable clamps on close, and since cable clamp target more of the side of tunica)
Imagine locking a cable clamp loosely but enough pressure to perform a “jelqing motion” as you move it up the shaft from the base

Instead of locking in a small O, ok with my fingers

Because I read somewhere that the dorsal vein on top of the penis is a crucial

But again I see the tutorial video, the guy is grabbing really hard with an O grip

Can you guys see anything wrong with this way of doing things?