Reset your centershot. 13/16" is a good "starting" pt. I'm relatively sure you must be having fletching contact with your rest close enough to your riser that a slicktrick won't clear. 28.5 sounds like a pretty common arrow length. Do some research and try to match up some arrows to your setup. Maybe yours are fine i'm just not familiar with them. You can buy most brands in half doz. lots and even one at a time at Wallyworld. Maybe you can borrow something close to what you need. I think your inducing torque to your bow so forget shooting paper and there's no guarantee the guy at the "pro" shop is any better. As most have said adjusting your rest ridiculously close to your riser was probably the wrong way to fix your problem. Do some research on "walk back tuning" and see how that works for you. Sorry to have you doing so much research but the information is already here and there's no need to rewrite the book.

Dan