It's really hard to be specific when you give so little information, for what kind of driving and so on, what kind of clutching do you have today, what is you unhappy about?
But to give you a general idea, to cover all the bases
Adjustable weights, like Supertips or Heavy hitters, can easily be tuned for your specifik req.
Straight cut 48° helix, or maybe an adjustable helix = Shockwave.
If you boondock alot you get better backshift with a stiffer spring like EPI Purple.