yeah distilled will work just fine, I've read you want to flush with water equal to at least 3x the volume of the pot. Also the dolomite lime is a very good idea in your case. soil ph should be around 6.5, maybe just a bit higher, like up to 7 but anywhere between those is good. Your light is good for veg, in fact now that you are using fertilizer, and once you get your ph right, I think you will see quicker growth. 200w of 2700k cfl (not standard t-

is plenty for flowering one plant. Main thing is to get the fertilizer and ph issues under control. It's important that you feed the right amount, in your earlier pics it looked like a N deficiency.