Hey Raven,

You should have plenty of light if the figures you gave for them lights are right, 40,000 lumens, a 400 hps don't put out much more than that, so plenty for 5 plants.

Personally i don't think the problems with your lights, i remember reading too much leaf was caused by feeding too much N, maybe you should look into your feeding routine?

Sorry at the best of times it's hard to put a number on yield but having no experience of that sort of light i really can't say.

If you've got any pics of the plants it may be of help to the more experienced grower, they may be able to spot something.

Good luck sorting it!