I dont understand why steezyd advised to start removing one og your LED lights and both of your CFLs to be honest.

The plants need more light not less... I think my advice would be better in adding some 85w CFLs and losing the heater. For the same cost of running the heater you will keep the temps up and give the plants plenty of light.

I will agree with steezyd that the plant is looking a little small for this stage, especially with 200w of LED and 50w of CFL around it.
Perhaps, as steezyd mentioned, your ventilation might not be enough and also you might not have adequate air circulation.

You should invest in a grow tent. it will make the world of difference.