Overly sensitive tweeter/midrange

Yes, I've tried that. I've gone back and forth. But the issue is subtle enough and I can't predict when it will do it. I just want to make sure (a) a tweeter or midrange are not damaged; or (b) the crossover isn't having some problem. I bought the SFs used. They were dealer demos.

If it happens randomly and only in one speakers try flipping all cables from left to right. If the issue moves with the cables to another speaker start eliminating potential culprits one by one by switching back the interconnects first then speaker cables. 
If the problem stays on the same channel after the cable move then it’s either the speaker or some sort of interference. Do you have a router or access point or mesh wifi node in close proximity to your components and cables?

You know, switch seating positions with your wife. :D

Seriously though, I’ve had untreated rooms create a kind of distortion effect above a certain listening level. If you two are sitting in the exact same place while evaluating it may be an acoustic phenomenon.

Otherwise, as recommended above. Try swapping speaker cables to test if it’s an upstream problem.

Oddly enough, if your drivers are rubbing thew would show up on an impedance plot.  Dayton DATS V3 might show you exactly where the problem is.  that may be too geeky for you, but I find it indispensable.  A driver rubbing will show up as an irregularity in the impedance chart, though it may only happen at a level too high for it to pick up.

Thanks all! I'll try your suggestions and report back.

Are you sure that you are not just hearing crap in the recording?  Certainly plenty of that if you've got the equipment to show it.