I get a kick out of the term "clutch kit", or folks saying that their sled is "clutched" . . .
All sleds are "clutched" from the factory with a setup that is the all around best for the widest variety of conditions and driving styles. The amount of testing that goes into that initial setup usually far exceeds any aftermarket efforts that go into a "clutch kit". These "clutch kits" are simply someone's idea of what works better for a specific condition and driving style. This works out well for a given type of racing, but usually not so well for trail riding.
That being said, you can most definitely tune your clutches for the conditions and driving style that suit you. What you can't do is simply buy a "kit" that will be magic for you. If the stock setup isn't working very well, there is usually a problem somewhere that will only be magnified by a "clutch kit". On sites like these you will find a number of setups that different folks have found work well for them. The ones that have tested these setups across a good number of actual sleds of a certain model and hp, are usually very good starting points.
I don't mean to be condescending or patronizing in any way, and if I seem so I apologize in advance. I just thought I would share one man's opinion.
Gearing a 2000 Phazer down 2 teeth on top really wakes them up. You really don't lose much top end except for perfect low drag conditions (hardpack with light snow on top).