[jadlem]

For my Hoyt and shiny new Mathews Switchback I've always set the arrow rest bang on square level with the shelf as close to the centre line of the bow as possible. On my hoyt this was really close to the shelf but got the most welly out of the bow. On my new switchback I've got it plum with the button hole as this is the centre of the power stroke on the string.

Nock travel is the most important thing to consider with the nocking point position. Once you are getting the most power out of the bow that you can it's all a matter of fine tuning. My best groups are now shot having tweaked the arrow rest up 1mm rather than adjusting the nocking point.

Try as many different things out but remember to get the most out of the bow and then worry about consistent groups. It's useless having great groups but wasting 10-20% of the energy of the bow, especially if you want to shoot heavy wind busting arrows at long distance.

Hope this helps.