Ok wanted to yell back to this thread as I think I finally was able to tune the bow to shoot the way it's supposed to. The bow has been very unstable since I got it last Dec and prone to shoot left when I slouch for even a bit. But now it's shooting straight lines just like my whippenstick and is much quieter than I first got the bow.
First off, the default nock height was not the reason I got fletching cut. It was the quills of my poorly fletched arrows. Right winged fletching for right handed shooters has this reputation of having bloody fingers.I stuck a narrow strip of electric tape around the pointy ends of quills and the cut is gone and I'm free to place my hand as close to the shelf as I like.
Second, once I lowered the crazy perhaps 1" nock height to around 1/2" or 5/8", the arrows fly more consistently and there's no metallic banging noise if the arrows are of proper spine. The bow is actually pretty easy to shoot well with a variety of arrows once I set the nock height to the right place. I shot 2018 29.5" w/ 200 gr point, 2016 29.5" w/ 145 gr and 3555 30" w/ 145 gr, all of them shoot straight and has no weird flight when bare shafted.
Good that I didn't sell the bow out of frustration because that would have been a huge mistake!