Ok. i had the same exact issue with my evader when it was new. Brand-new tires on it (stock ones) and ANY surface it would just start doing doughnuts with throttle! I was SOOO frustrated i wanted to throw the thing into the wall. Turns out that bowtie's simply flat out suck in my area. NO one uses them here. I got some dirt works for basic bashing.. huge improvement. I also got gladiators for racing, and masher 2000's for more bashing. The masher's are excellent traction for me.

Also.. you REALLY need to ease up the slipper. I loosened mine to the point where it just barely won't wheelie anymore. Now it is muuuuch more controllable.