Well I'm just like you when it comes to overkill. Everything I have is design for a room much larger. With the filter outside the tent and pushing air into it hasn't gave me a problem so far but I will expect some during the summer months. Right now it keeps the outer room about 72 and inside the tent is about 75 - 77. I have two Max 8" fans rated at 675 cfm each which is extreme overkill for both rooms. The split in the room has cardboard sealed with plastic and mylar on both sides. I didn't want to spend the extra money for shipping two tents so I decided to make two from one. So far so good on the light leaks but who's to tell in the upcoming months. I zip myself up once a week just to make sure there or no leaks in my flowering room. Gorilla tape is my new best friend now since I've used so much of it... lol. Everything looking good so far on you end. Will redesign after my harvest in two weeks.
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