Well there is no reason why you cannot run cooled hoods AND still cool the whole room.
Given the choice though I would say cool the whole room (if you could only do one or the other) and this is because you HAVE to have a source of fresh air, this is not optional!! Unless you are doing a TRUE sealed room and I have no experience with, nor do I desire to fuck with, one of those. f'real. LOTS of tweaking. It's for nerds lol.

Dry leaves... have your intake duct blowing in among the pots rather than right on the leaves..you'll still have a couple little fans scattered around the room... helps prevent mold and shit too. And keep up on watering. Generally dry leaves are not a result of the air flow; if it really IS a transpiration problem the plant will look wilted like it hasn't been getting enough water, when the leaves go crispy-dry like that I'm gonna say it was actually straight heat stress.
okay I gotta run, that's all you get for today, now go build something.