hmmm yeh this is really,but really one of the hardest(maybe the hardest) things to do,but I think it can be harder with normal gravity,because the movements are different,it's harder to balance yourself and if you exaggerate you can jump,so,when you have time,try it with normal gravity,maybe with classic,so the uke's body (well,what remains of that) won't be a problem,because the dq is off.
it will be a resistance thing like:OMG he juggled for like 5000 frames XD