I use a 6" 347cfm inline with a phresh 400 filter in a 2x4x5 with a cooltube 600... I have to dial the fan ALL the way down to counter the negative pressure in the tent, but smell is nonexistent. Ambient room temps are mid 70's, my tent hits 80-81 mid light cycle.
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I have a4x4x7ish tent and for the first time 2 months ago put, just standing ON THE FLOOR of the tent, a 12"x4" phresh filter with a small 150cfm canfan sucking and I cant believe it, smells are down to 1/4" wat they were. Sitting on the floor. So impressed I bought an 16"X6" phresh filter (400cfm) that I will it hang in the tent and expect no smell outside the tent.
Wow youre tent is 2x the size of mine so Im guessing that would work great in my small space!! Are you using the can fan brand 4 inch?