Hanging with Vachanger 3 and dark Blue to black head

Hello guys I have a question about using Vac-hanger 3, the head of my penis would always turn blue to black when I hang for about 30 minutes. I am only using 1.5 pounds of weight. I have contacted Vac-hanger about this issue and I was recommended using surgical tape to tape the shaft of my penis to protect from swelling. Now, I taped my entire head but I am still experiencing the same problem. So, is the dark blue to black color caused by poor circulation? I am worried about damaging my penis by cutting off too much circulation from it. Please educate me and shed some light for me, thank you guys !

You may not be conditioned to the vacuum, try using as little weight as possible and ease into it

I hope that color goes away after you stop for awhile. If you continue to hang without solving the issue, the color can become permanent.

If you haven’t taken a break to let it heal, you should do so now for at least a week and maybe more.

Thanks for responding guys ! I mean Once I take off the Vac-Hanger, my head return to like normal color in like couple 5 seconds.

So, I guess this is all normal? If my head returns to normal color in seconds?