Humidity for Grow Tent Auto Flower in Flower Stage?

as a follow-up to your last question -- this will eliminate the possibility of climate being the cause of your droopiness. If your VPD isn't extreme, it's not due to temp/rh combo. if your vpd was sky high 1.8-2.0+, then it becomes a possibility... maybe even a lower threshold than that, but i wouldn't assume where to draw the line in a specific way. plants can mitigate such stress in the short-term and then show worse signs later. I've stunted growth with a high VPD before. it definitely can happen. looks all droopy and tired for no reason.. little growth occurs etc..

VPD, VPD, VPD... Temp without RH is half the story. Anyone making suggestions wihtout mentioning the other is just making up random numbers as a suggestion. Leaf temps are what matter, here. Figure leaf temp is 3-4F less than atmospheric temp when referencing a VPD table. In flower you probably want anywhere from 1.0-1.5 kPa. Usually the vpd tables you find will show 1.5 as "yellow" color-code of being slightly too high, but this will vary a bit depending on which one you look at. i've seen many ranges of suggestion, unfortunately this can be species specific, so we really need the proper research across enough genetic diversity to give a proper suggestion. Sticking to sugestions for other flowering, soft-stemmed plants is good enough for now. Can google for that type of reference information. The other rule i'd follow is avoid high-risk levels of humidity - greater than 65%. If your temperatures are demanding a higher humidity, probably better to cool it down a degree or two rather than boost humidity above 65%. Preferred temperature ranges should avoid a need for high-risk humidity. If bothering with co2 supplementation, then you should have proper and tight climate controls to make it worth it. Should be 100% your choice, but maybe, you only control one of the 2 tightly, in that case you let one fall where it may and then adjust the other for a proper VPD. anecdote - my temps are whatever averages out, because i am cheap and heating/cooling is expensive, but i grow during a time of year where it consistently settles around 25-27C (atmospheric reading). Then, i use a VPD table to set a target for humidity based on those resulting temperatures.