I don't know a lot about it. My wife is very conscious of mold in the home. If she see's any on our water filter for example It gets bleached off and I get a talk to on sick house syndrome. She's sensitive. I don't want to sound alarming. Just if you can get a test for mold in the air and it tests positive, then there's a place to start to remediate. Mold gives us lung issues.
Your plants have PM when you keep rh at normal levels. That and being sick gave me these thoughts. Hope I'm wrong.
You may be right about sick all year if mold. I'm not sure. I'd still have a look.
concert 
I seen last year. CL
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