Why use a tent? The tent frame is good enough. Hell of a lot easier to control the RH and circulation strength too. Fans inside a tent are pretty much impossible not to cause a heavy breeze across the buds, which will dry them too fast.
if you must.. you need a hygrometer to see if the lower exhaust fan setting results in a proper RH% (~60%). Thisi something you need to measure and not take someone's guess online.
If temps and RH% are good, all is fine.. assuming the buds aren't getting air blown across them as opposed to just enough to maintain a consistent RH.
Take the canvas off... put a fan in the room (or the humidifier fan might be enough, too). Keep it simpler.. not complicated. No need for a duct fan and a enclosed tent.
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