Ok first of all your temps are a very big conern to me.. "photosynthesis is best performed in temps ranging from 74-78 degrees celcius" - Garden Knowm. THIS IS IMPERATIVE. 80 is OK... 90, pushing it... Anything above and your asking for hermaphodites. Those generic reading cfl's aren't going to cut it either, they are neither sufficient in lumens much less spectrum.. I would say definitely switch to your 400w Mh A.S.A.P. But keep in mind this is going to create even more heat problems.. your going to have to accomidate with an extra fan or two.. two if they're crappy one if it's decently powerful. Just position it to blow on the lights upward, to push the hot air up. Hope some of this helps..

Cheers