RR,
G, F, & K each has obvious benefits, but each also has downsides (over-weight, paralysis, and jitters respectively). Luckily they are interrelated and can counter-act each other. Think of them like this:
1.) Friction counteracts the jitters resulting from High K. 2.) K counteracts the crushing of high gravity. 3.) Gravity provides traction to overcome the "sliperyness" caused by high F.
the trick is to find a balance.
Most fast models will has very high g, very low f and as much k is necessary to counteract gravity without causing jitters.
So in short, the solution to your sliperyness would be gravity, but keep the balance of the whole in mind. tuning is a 5 dimensional (g,f,k, amp., speed) process of trial and error.
-w
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