You may wanna shut the one labeled 300 off.
If you cannot raise the lights, then you need to turn them down...only way to do that in this situation is to shut one down.
I am not familiar with your lights, but you will need to research them and look for "actual" power draw and that will let you know what the real wattage is you are working with.
When did you flip to flower?
Also look into getting a taller tent. Mars hydro having a sale right now actually. You in a 3ft tent? Can you hang the lights from shorter cables?