Quit dicking around with the light schedule.

Personally, I'd put 'em under an 18/6 schedule, and leave 'em there for a couple/few weeks to recover from this abuse. If you keep switching, and not allowing acclimation to the new schedule, they'll turn bad on ya. Never put a suffering plant into flowering. If you keep it vegging for the next couple of weeks (barring any further abuse) the chances of hermaphrodites diminishes.

Although it is possible to grow plants under a 24/0 schedule, it isn't optimal, and it can do more harm than good for a suffering plant.

If you are going to offer 400w of light, it would be a much better plan to get a 400w HPS. It can be effectively used throughout the growth and flowering stages. Provides many, many more lumens, and the usable light penetrates deeper. If it is a sativa dominate, the 400w HPS will be necessary. Your existing lights will not penetrate the canopy very deep, nor do they have the lumens of an HPS.