Remember,the further above the hole you go,the further you get from center(no,the hole is not always vertical center,sometimes it is the shelf and sometimes it is the grip)The more foregiveness is affected.I am not saying it will be a huge issue,I have shot bows this way for hunting,but I did notice a loss of forgiveness.The closer to the shelf you can get,the better,atleast in theory.All my targetsetups are set as close to the shelf as I can get them.


The vertical problem might be the angle of the rest,just trouble shooting here.Does the rest sit flat on the shelf when down?(obviously it doesn't,just reread the original post)Is it possible to get it to sit flat by changing the angle of the prongs?(maybe scoot it back,up and adjust angle)Again,just trouble shooting.


Watch this short video,I have no idea if it has anything to do with your problem,just something else to look at.

http://www.youtube.com/watch?v=eZK7O_s1Rq8