400 watt hps/mh in a 2'/8'/8' closet

What would be the max plants in this set up. Currently I have 11 clones from a local california club. I underestimated the whole ventilation thing when I first flicked on the lights 2.5 weeks ago and the next morning they werent to happy. All seemed to recover fine except for four which seem to be lagging far behind. I am still waiting to drill a ventilation hole to mount a fan but have drastically improved air flow with keeping the door cracked and using a second fan to push cool kitchen air in. Yesterday I lowered the light to about 8" with no adverse effect. I have topped and tucked away leaves like suggested any other tips or ideas? Thanks

Weed is good...
But hash is better...
And oil is the best!!!
and ROMULAN GOO is just ridiculous!!!!undefined