Don't ever be symmetrical.
Try to be more relaxed (read: avoid the hold all button).
People like replays fast and brutal - the flying in the air with uke at pein_hahas was nowhere near fast and brutal. Avoid just flying or standing around doing nothing.
Grab isn't always the best way to dismember and generally avoiding grab makes replays more enjoyable to watchers. Of course, if you're not very experienced yet, you wont be able to make anything really good with grab, but you could start off by not grabing on the 1st frame and only using it if you really feel like you can't continue without it.
It there are still 200 frames left, don't stop playing.. There are still joints to dismember = (Pein_heh for example).
You might want to try ending your replays with a pose - don't just fall down like a retard, try making a tripod or even standing up in a cool way.