84 v30 magna, redid carbs now throttle linkage on back is real hard to turn

VF500- pulled carbs for tune-up, now rear 2 throttles dont return
hoping someone can help. first time poster. 84 magna30 (vf500). didnt run it for several years, pulled carbs as a unit and cleaned. started right up, but idled real high like 5k.

checked throttle linkage, pulled carbs again and unhooked linkage to rear 2 carbs. front ones move (and return) just fine. rear 2 real hard to move....

wasnt like this before, so maybe i bent something. i've carb cleaned and wd-40 on linkage. its gotten better. please help