RE: I'm at a loss.Well.
 

Some shooters, even very skilled shooters, do not buy into the rest-tension aspect of tuning. From personal experiences, I wholeheartedly do.

Considering that you might have a marginal spine issue that can sometimes be corrected with adjusting the tension of your rest, but that you cannot control the tension on bristles, you might try lowering your nock height to the degree that it (nock height) puts your arrow on a more horizontal plane to relieve some down pressure that may be occurring when you shoot.

If your shaft is pushing down as you shoot, contact with the rest may be occurring. If the contact is at the top of the nock end, it could cause your shaft to nose up and send your arrows higher than your POA.

RE: I'm at a loss.Well.
 

Set the arrow on the rest and get it lined up with your rest mounting hole--the arrow should be square with the string(90 degrees).This is a good starting point then make very small adjustments as needed.Half the fun of shooting a bow is all the tinkering.

RE: I'm at a loss.Well.
 

Yep, it's half the fun but it's also 90% of the frustration. ;)