cool dude, I think you should still get at least one inline fan and run some duct up and out of your grow area. having a fan on top wont reduce the temp. The heat has to be exhausted from the room. but in my experience (having had a few 1k units) its better to spread out the lumens via smaller lights.
--- Best of luck and p.s. if you need any help with the ducting hit me up. 10years+ hvac