No idea on last question, but would like to comment on OP.
First of all, big time congrats to you for getting to this point. So many people give up on bare shafting. Besides matching your shaft and building your confidence in it, it will also show you shooter technique flaws that can be corrected. The stuff you learn will help you a bunch as you go forward.
Where you are is probably fine with fletch. But for funzies, I would put some duct tape on the nock end to match the fletch weight. I would then start backing up 1 yard at a time. Sometimes stuff will show up at 25 that did not at 20. Its usually non essential, but still fun to prove to yourself you can do it!