It's either you have too little compression damping or the rear ride height is too low, giving the bike a "nose-high" attitude, or you have too much compression damping, making the suspension "pack down" -- either will make the bike run wide.
Good to hear, Mad Si -- try raising it to +4 up to +8mm, made a world of difference on my J1 [^]. I hardly countersteer, more just lean in the direction of the turn (of course my hand pushes the bar a bit as I lean), and she turns without a fuss. [^]
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