Nice setup=) Looks like alot of work.
It does look like maybe ur only using half the capability of ur fan. A squirel cage fan like he one you have usually will have both sides suck air in. It looks like you only have 1 side with ducting? I have the same style fan in my studio and have it in a box to focus the suck to one hole, making it twice as strong. This will ensure nasty air isnt pushed past ur ventilation (through the hole in the other side of the fan) and back into your studio.
If i got the fan type wrong i apolagize ahead of time.
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