I have a 22.5 degree crossover, and some of my cars "wobble" when they go over it. I have not had derailment issues, however my speed over the crossover is typically less than 15 SMPH. Some engines can "stall' on the crossover if the speed is below 8 SMPH.
If you can isolate the problem to a few cars, you can always change the trucks to a style that does not give you any problems.
Good luck: JoeK