Tommy, you did send me the diagram, and I am forever gratefull

The verdict is in. It was the Saunders Deadly Quiet.

I thoroughly inspected my bow, no cracks, loose parts or screws, cable and string all in their proper tracks, cam rotation dead on where it was set last fall. I did notice a small amount of fraying on the string where it impacts the DQ, which furthered my suspicions.

Confident the bow was ok, I shot a few more times, all still low, though not as low as before. So started messing with the DQ.

The DQ (as seen here, I have the PRO- http://www.sausa.com/pp7.html ) has a carbon plunger that inserts into an aluminum tube and is surrounded by a section of foam " hose" Upon the shot, the plunger, well, plunges, and the foam helps absorb the impact, and acts as kind of a spring to un-plunge the plunger. That is, until it wears some, which apparently doesn' t require many shots.

I found that the plunger didn' t fully plunge every time, and something about the DQ was causing it to hange up. I surmise that the first shot when things went wrong, it didn' t plunge at all, causing the string to stop short, leech to slide up and fps to be lost, resulting in the low impacts. I can replicate this with my finger applying pressure, sometimes it just doesn' t fully plunge or plunge at all. Don' t know or care why, I have no confidence in it. Took it off, first shot was right back where things were before this all started.

Long story short, it' s off and things are back to normal. Thanks for everyone' s input...