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70f @ 50% is ~1.45 kPa, and 60-63 @ 60% is ~0.8-0.9 kPaI found 70f at 50% for 3 days then 60-63 at 60% until ready to jar. Depending on bud size anywhere from 10-20 days. Just what i found to work well for me.
Sensor placement is key. Air movement is key but never directly at the buds
I'd have to use at least 2 different temp/RH combos... one starting a bit after dawn, and the other, after sunset... to sustain that VPD...
Evaporative coolers have a hard limit: they max out at a 40f temp drop from outdoor ambient @ <10% humidity. Also, as humidity rises, this max temp drop goes down.
So I can't drop and hold a ~110f+ outdoor ambient temp to more than about 82-84f in the tent... but I can drive up humidity to bring it to those VPD targets by using a dual micro-climate (mc) approach and running the 2nd evap cooler in the shop's ambient (around 100f+ and 30% RH) and venting the tent's humidity back into the shop.
Then, fine tuning the tent's mc is achieved by adjusting the mc RH of the shop.