Adz,
IMO bumpsteer is unlikely to be the cause of your issue. You can check however simply by looking down at the front wheel from above and seeing if it alters from toe-in to toe-out at all during suspension compression. if it does, then you have bump steer - although I still reckon that is unlikely to be highly noticeable on-track.
From what you describe, it sounds as if you are not achieving full lock. The 22 can be quite sensitive to overall travel available on your Tx and indeed, I find the low profile servo is more fussy than a normal profile one.
I have to set my travel limits on my radio at 150% travel - at 100% they would not achieve full lock.
What Tx and what servo are you running? I reckon this issue is more likely to be a lack of overall travel setting on your Tx - but as I said, a low profile servo can exaggerate the problem further.
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