My greenhouse was always sopping too, and I've had problems with
tomato plants wilting. Sinice I opened all the windows things seem to
have gotten better. There are some blossoms, but no fruit yet. The
plants seem healthier, though.
I've used the black weed barrier material as a shade on the greenhouse too,
when I've moved plants from in the house (poor light) into full sun.
Otherwise the leaves will burn (turn white,) but that's usually temporary,
but disconcerting none the less when your lush plant that was trying to
scrounge up sunlight now has more than it can stand.
Professionals used a lime white-wash to diffuse the light, but I think
that's another issue.
Certainly open it up to air. Also a bit of a fan will dry things and the
movement will cause stalks to thicken. Good luck.
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