Mine feels exactly the same but is fine when running on track. I found you perhaps need to run a slightly tighter mesh than in some other cars but the rough/notch noise is almost certainly the magnets in the motor. I have a fairly new SP 6.5 in mine and it sounds like it matches the description you have made. The kit spur isn't very round; the RW will be rounder for sure. This can make meshing a bit more troublesome but should still be possible.
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