As Frecklychimp has said if you are not running a control tire I would try a tire a longer spike as had already been mentioned. I'd be tempted t try a schumacher silver mini spikes all round.
As for setup changes, when I ran mine rear motor I felt the 25 degree kickup and 10 degree hubs gave nice progressive steering and helped with on power steering. You could also try lengthening the front link to hole 1.
Otherwise it might be a case of playing about with where your weight is located.
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