Just wanted to make sure you're aware that you can have nock pinch AFTER you draw back but it seems okay before that. Nock to string fit can be ideal when you check it on the string before drawing, but then the d-loop can pinch the outsides of the nock when you draw back. This is why many have started using soft nocks inside the d-loop. Just something to make sure isn't happening also.
I have an arrow guide/holder on the shelf of my bow that I have a Hamskea on, I had to trim it down to keep from having fletching contact with it. So, that can be another issues that might be created if you add one.
The Vapor Trail holder holds the arrow really well, but so well that the arrow nock can unseat if you try to draw with the arrow fully snapped into the holder still. Limbsaver makes one (a "shag pad" comes with it) that I prefer to use. The height of it does need trimmed down some for better fletching clearance. It holds an arrow until the bow is tilted to 75° or so.
As far as the arrow catching on a part of the felt, that's very possible. I have gone away from using felt or moleskin on a launcher, instead I started using UHMW tape I buy off Amazon. It is fairly slick, sticks on the launcher well if you first clean the launcher with 91% alcohol, and it takes forever to wear it down. I get it in 1/2" wide and 3 mil thickness. It is around $10 bucks for a 6' roll of it.