Do you swap over from training wheels to racing wheels before races? That will alter the chainline enough to cause problems. Best to ride racing wheels a day before the race and get your adjustments down. I think the current Ultegra chainrings would be pretty hard to bend, but it never hurts to look. Let a mechanic take a look. I don't remember ever being at a race where there weren't several shop mechanics. But I haven't raced my tandem yet.