My grow space is 75 cubic feet and my fan and filter are 4 inch 190 cfm. I have a 600w cool tube that the fan pushes air through and goes out of the closet. On 100% power it stays 90 on the canopy and hits 100 after about 10 hours. On 75% it stays 85-90. I don't want to be using it at 75% though i want all of the light i can get. The cool tube is 6 in and the fan and filter are 4 in. With over 2 tines the room every minute i figured it would be cool enough. Any suggestions?