Go T5, or HOT5 if in the budget. Cost vs what you get will be better than T8, no matter which bulb manufacturer you're running gear-wise... that said, how dry are you letting the soil get before add more? I will assume you're not putting nutes at all in just yet, and most certainly keep an eye out for rootbound issues. I see what appears to be the -very- start of leaf crinkling in one of the pictures, which could be just due to camera angle and lighting. Everything else is lookin' good and I wouldn't worry at all. Can't wait to see the transplant, and if you notice a color change and a slight droop on transplant, don't panic - that's normal for most strains.