OK, new information. With the motor running, when I crack it open far enough to open the secondaries they do not close. I think I need to put another turn on the secondary spring, re-center the secondary plates in their bores or both.
I've run into issues like this, and found I hadn't carefully tightened the nuts holding it to the intake. The torques were all over and it apparently warped just enough to stick slightly (mine is an FItech though). Loosened and then re-snugged, problem went away.