Rod,

I can't help you with the Darton timing marks as I have no experience with their line of bows. Maybe Len or one of the other Darton guys can give it a whirl.

If you are unsure about the number of turns on the limb bolts then just start from scratch. Crank both all the way down and mark a line on the limb bolt face pointing down towards the riser with a permanent marker. You can then use that line as a reference point for backing out the limbs. Ofcourse, check tiller, etc.. when you have found your desired draw weight.

As for vibration reducing devices.....I am a big fan of them. Here are some items I recommend highly......the original Limbsavers for solid limb bows, Sims Stabilizer Enhancer 2000 with or without regular enhancer attached and the PSE NV system for the limb bolts.