Millertym,
Are you dead sticking only after you bring the throttle down near idle, maybe the lower 1/4 of the throttle range? Or does it happen when the engine is running in the higher rpm range? I was under the impression that your dead sticks were happening with higher rpms, but now reading it happened after touch-and-gos, you were probably down near idle and getting bogged down by the low end valve.

If you have your plane on the ground and get the engine running up in the higher rpm range, play with the throttle, keeping it over half throttle, and see how it works, then bring it back down to idle and let it idle for 20 seconds, and try to advance the throttle again. If you're running fine at higher rpm and only having problems when you go back down near idle, than it is the low end valve. If you're having problems at higher rpms, half throttle or above, then it's high speed needle.

If it's low end (happens when you go somewhere near idle then back up) you can turn the tiny screw inside the throttle arm (1/8 turn increments) clockwise, with the engine STOPPED, then re-tune your high end, and see how it works. A small change on this screw makes a big difference, so do it little bit at a time.