Sorry I haven't been back by !

From the looks in your pictures .......I would say your getting some nock pinch ! I would take the brass nock out and just shoot with the loop and see if things improve any ! It also looks ....from the side view.....that your rest is a little high ! May want to check your nock point too !!

The WB is a good rest and may be worth a try.......but I would work out the other problems first and then try one !!

Good Luck !!