Yeah, I'll give the humidistat a try. I do have a concern about how effective it'll be with whatever is going on with my system, though. My understanding is that opening the humidistat jumper on the VS AH drops the CFM to 80% of what it normally is, until the humidistat closes the jumper again. Last summer, while I was tinkering trying to figure out what was going on, I changed the CFM jumper setting to various levels. I even set it down as low as it would be if I used the humidistat, and I saw absolutely no change in the condensate flow. That is what really freaked me out. Lower air flow should lead to a cooler coil, which I had thought would lead to greater condensation.
I'm not completely educated on how the TXV behaves in these various situations, and I was just wondering if perhaps the issue is, as beenthere suggested, a problem with the TXV itself.
I think my first attempt will be to pull the humidistat jumper and just see if that makes any difference, before actually going to the expense of getting a humidistat installed.