As annoying as it sounds, you may be right in the option of having to opt up to a higher radius of track corner. This engine just does not like these 22's. I'm feeling that in learning about the turning radius of this engine, that perhaps I caused an issue with this engine trying to get it to originally maneuver 18 inch turns. Learning at the time about how this engine will not do anything under 22 inch corners had me hot under the collar, as I did not see any detail about this issue when I first purchased it. Only later reading online about it's issues, had me understand it all. Now, with figuring out (Thx ACY) that the most probable fix, due to this J's "permanent coupler", that I have to hope that 24's do the job. I'm at my wits end with it all. It IS good to know that this strange coupler (to me) is on more than this type of model and doing well for those that own one. Here's praying...