In rear motor config, you 'may' get away with shimming the blocks up as the front block won't affect the gearbox height like it would otherwise do in mid config but you may have difficulty in aligning the motor guard properly.
If you really don't want to go HRC, then move the hub link position further inboard to shorten the link. (2B with 2-3 washers on the hub and 1 on the tower would be my current starting advice)
You could also try fitting a couple of washers between the wheel and the hex to widen the rear track. I think the car width is narrow enough to allow you to 'play' with the track to alter the drive characteristics.
Make sure your front link is long and don't run any more than a total of 30 deg caster. Currently I would suggest either running the taper wedge under the front kick up with the standard 10 deg blocks or possibly run the flat shim with the option 5 deg blocks.
Increasing the kick angle theoretically should reduce the weight transfer on the front - which you may find to your liking. Personally, I'm running the taper wedge with the standard blocks.
Hope this helps loosen your hat in terms of your 22's handling characteristics.
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