I'd love to say I'm certain about this reply, but the fact is I am not because I haven't tested it yet. So here is my theory. (P.S. If you would care to help me test it someday soon, that would be greatly appreciated. When I do, I am going to record it. And then probably post it on here).
Anyway, the theory:
The recoil is the same, regardless of control types. It differs based on the gun/attachments and that is it. It still is an Aim Assist thing. I feel that sometimes we forget and assume it relatively only pulls right or left, and that's because that's what we feel in the vast majority of situations where it applies. Reality is, it pulls in all directions, including down when a gun is kicking up (recoil). Most die-hard Wiimoters I talk to, including yourself and others on this forum, say that it is extremely easy to break the "Aim Assist lock" with the 'mote due to natural hand movements. And there is where we have the difference that has gotten you so convinced that the recoil is higher.
I just vote remove the Aim Assist altogether. It could be just for our versions of CoD, and that wouldn't bother me either. Cuz it's all a vicious cycle when it's there. And there wouldn't be separate recoil coding for control styles. There's coding for the guns and how they work.