The 11 cfls will get real hot. I know because I had 12 in my closet and the temputare was around the same as yours, even with 3 fans for ventilation. Recently I built a stealth cab that is a about as big as yours and I am using 6 CFL's. With (2) 4 inch PC fans [One for intake and one for exauhst] The temps range from 75-84 [outside temp 70-80]. Also, you should look into SCROG or SOG growing because it might be the best way to grow in your cab.

I hope this helps

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Thank You Prop. 215