Also when you transplant, use a hell of alot more perlite. atleast 30% perlite. I use 50/50. Not alot of people take this advice but man it makes such a huge difference.. you see perlite dosen't hold water so if you have a 50/50 perlite/peat mix not only is there MORE oxygen available for the roots to thrive on, but it's more lightweight therefore allows the roots to grow through the medium easier (which means an overall healtheir and more robust root system), not to mention it's very hard to water.

Peace