I have a similar setup and run a dehumidifier outside of the tent which is in my rarely used dining room (after moving downstairs from a spare bedroom which got way too hot). I never have any over watering issues and generally use the weight of the pot to help determine whether I should water or wait. It’s been working out pretty well.
One thing I would recommend is if you are concerned about space in the tent, then you should bite the bullet and flower. I waited a bit too long with multiple plants in veg and just didn’t have the space for all of them. Had to give a few away and left 3 in there which is still too much. Luckily after pruning and LST it made a big difference, but a bigger tent for flower is definitely not a bad investment.