I have geared diffs in my K1 and I really like it, seems to have more punch out of the corners and the car seems to corner a bit better. But I think the gear diffs seem better for high grip tracks like astro whilst on dirt the ball diffs would be better.
If you are finding the car tail happy though that seems to be more of a set up issue, try the TrishBits rear weight and putting the rear upper suspeion link on the outer hole.
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