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I think it has more to do with the distance between the trucks than whether they have 4 or six wheels. I have an Athearn SD9 (the first US loco I bought, in June 2001) which runs very well on Second-Radius curves. (not sure what radius these are in inches, the Hornby website doesn't give this data) I also have an Athearn AC4400 which is not too happy on these - it doesn't derail, but it makes noticably more noise which doesn't bode well for the future of the gearboxes! Interestingly, I can run Husky Stacks on these curves with little trouble - that may be because I glue a piece of roofing lead cut to shape into the bottom of each lower-deck container, this also cures wobbling.
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