I think the assumption that you don't want bump steer is not correct, after all every real car sold today has it, and race cars too.
It's easy to confuse bump steer with driving straight and the car steering itself on the bumps, this doesn't happen and isn't the reason for it.
What is used on real cars is a small amount of toe out as the wheel moves into bump, which is exactly what the kit build leads to. This has the effect of slowing down the response of the car as you turn into corners, and the faster you go the greater the effect.
So if you have a set up that feels a bit edgy on turn in, especially on the fast sections, adding some toe out bump steer can have a dramatic effect in making the car feel more stable allowing you to drive a bit more aggresively, and making the car easier to drive.
I think the 22 has a few modern car derived ideas, like the steering rack and bump steer, as well as low roll centres and lower front kick up. It means the set-up might need to be pushed a little outside of the norm to get the full benefit.
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