I think I got 5 joint, but I'd have to see what you guys say about it. 100 distance+DM Chest+Lumbar+LeftPec+Both Elbows nothing used more than once, also Grabby left hand (not sure if this counts as a joint to you guys but oh well). If I used more than 5, tell me what I did so I can go try miserably again... I did use Shift-Space, I am not sure if that's illegal for this or not...

EDIT:Yes it is 5 joint, I did it again to make sure.

Relax All (of course...), Rotate Chest Right, Bend Lumbar Left, Contract Left Pecs and Elbow and grab with your left hand and push Space twice, then push Shift Space 5(or 6) times then contract your right elbow, That should decap Uke using only 5 joints. Giving you 42246(41803 with 6 shift spaces) damage if you don't do anything else. This does not work if you don't shift space 5 or 6 times after Spacing two times.

EDITx2: 30 Frame Decap!