I think something is going on at the roots, though a few different things can cause that. Overwatering or root bound are really common triggers for root problems.
The humidity it a little too high at night, which you'll want to fix soonish if possible so your buds don't get bud rot. The plant also doesn't drink as much when there's high humidity and is more likely to get overwatering symptoms. I don't think that's causing the symptoms, but it may be making them worse.
Is the humidity getting high because you're turning the exhaust fan off at night? If so, you might consider leaving the exhaust fan on 24/7, or possibly put it on a timer at night so that the exhaust fan turns on periodically and clears out all that humid air (plant leaves are constantly giving off water so the humidity will get higher unless the air is refreshed). The extra airflow also can help a plant deal with overwatering. The temperature gets a little high but overall it seems OK.
Has your plant been in the same pot since the beginning? If so it may be root bound. How long has it been flowering? You don't want to transplant to a bigger container too late in the flowering stage if you can avoid it, just to prevent possible stress. But a careful transplant can be done and shouldn't stress the plant too much if you avoid disturbing the roots at all (just put the whole root ball in the new pot, without shaking off any of the old soil).
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As far as watering, what growing medium are you in, and what nutrients are you using? When watering you don't want to give a set amount of water every time on a schedule. You want to listen to the plant and only give water when it needs it. With most growing mediums you want to water your plant until it gets a little extra water out the bottom then remove the runoff (don't let plant sit in it). Then don't water again until the top soil is dry up to your first knuckle.
As far as yield, it depends and it's really hard to guage. There's so many factors including whether the plant stays healthy and what grow light you're using. That being said, I think you'll definitely get some nice buds off it
