Getting off the line?

[DEATH_INC.]

Try more rpm and more slipping, more rpm makes it slip better....but it's a bit harsh on the plates....though I've seen a guy on a gixxer like mine run real fast times at the drags by just revving it and dumping the clutch (no slipping at all) with just the right amount of rpm so it didn't pick the front up 'cept for a small hop....
As for body position, try lying on the tank, balls hard against the tank, with BOTH feet down and as far forward as ya can. This both moves the cog forward but having both feet on the ground launches ya straight, and having 'em forward means also that you move further before you move your weight off 'em, again keeping you straighter.

[sinfull]

I have no real idea with hyd clutches, but would it be possible to place a reducing valve in line to slow the released fluid up slightly ?
Would be a trial error thing with the sizing to get it right, but ya never know if it works, patent it lol I'll have half !