I'm not much of a freestyler myself, but I think the Kombats have quite good pop to them. Of course a dedicated freestyle board liek the Flare would be even beter, but such a board will not be as versatile as the Kombats. Loops and stuff is great with the Kombat.
How you tune it for high wind is a bit dependent on you sailing style. But usually you want to go for a smaller fin. How small depends on sail size, water state and your weight. Except for the fin, I use the same trim as I normal do also when I sail my Kombats in high wind.