I've been using the 10x1.1 pistons for some time and really like them. 25wt all around is a good setup. Depending on how much traction or how bumpy the track is I might go up or down in weight in small increments (usually plus or minus 2.5wt and no more than 5wt). They work really well on clay indoor tracks as well as large bumpier outdoor tracks.
The 10x1.1 pistons change the rate of damping. Meaning, when you try them for the first time, you might think your buggy is underdamped. But really the suspension will be very active and soak up the small stuff well, and the damping tends to increase as you increase your compression rate, so you will have enough pack to handle the big hits.
are the holes in the piston bigger or smaller than stock? where can i find them?