As far as the tuning bowtech will tell you the same thing. They are not real clear on exactly how to do it or where the referenence point is. I was told they do it on purpose because it really isn't that important. My shop apeased me by drawing a line on my cam that lines up with my limb for a referance mark. I was going to do that any way. Didn't matter though because it hasn't moved since the day I bought it a year ago, and I even cut a few strands on my string by accident.

My darton has very clear timing marks and good instructions on how to adjust them. However it is a hybrid cam. And I was also told it really was not that important, the bow would still shoot well if they were off. And they were right, I have had them severely off the marks before and the the bow still shot fine. It may not have been as effecient, but it still shot great.

I bet with every bow and set up you would have to actually play with the cam setting to get it perfect, one measurement or setting probably would not be optimum for every set up and draw length.

Mathews is not very clear on how there timing works either. Well actually they don't have any. It works about the same as the bowtechs do.

Parker has been around for a while I don't see them going any where soon.

Paul