What's too hot? Got some temps? Or humidity % ?
What size tent? 2 x 600hps would be quite warm but cannabis loves the heat. And you are correct in saying you'll need higher humidity to make them more comfortable in that heat. Will want it way less during flower though to avoid mould
Down under... Haha
Myself and two other Aussies created our own forum. Quite similar setup to 420mag. Developer used same software by the looks.
Haven't happened to hear from the scrogdawg of late?