The way you discribed your airflow is PERFECT and exactly how you should be running it GOOD JOB!! +rep for you sir!
HOWEVER , 7x7 is almost 8x8 and 8x8 is NOT SMALL....thats a BIG grow man.....8x8 would require 4 1k lights or 6 6k lights that is by no means a small grow bro..... So if your room...