Fritz,
Adjusting the draw stop peg and module takes all of about 2 minutes.

You don't even need a bow press. There should not be a problem getting that done prior to a paper tune provided he has the specific modules that you need in stock at the shop. I would probably suggest going with the half inch shorter module first and then trying the full inch shorter module to see which eliminates the string slap...if it does at all. Grip/arm position may also be playing a role.
You could try a set of the new string leeches instead of reverting back to the the usual rubber cat whiskers as you would not lose anywhere near the same amount of speed.
Feel free to use the centershot tool or my string/arrow level set whenever you like. They are a breeze to use and make tuning a bow so much simpler. I had been considering starting a thread about them and I think this might just be the incentive I needed.
Actually, I have a chrono but it acts flaky in cold weather....or it could be the battery...I forgot to check that [

].
However, that model that Lonnie has which you are referring to is called the Radarchron. I picked one up at Cabelas yesterday but found it to be a bit slow, though consistant, from what I expected. I have a new traditional style chrono on the way as we speak. I should have it by tomorrow. You and Lonnie are welcome to use that as well....even if just to check it against the Radarchron.