You definitely want to pull the hot air out of the room. If you add cool air to hot air, it will only make the cold air warm. Also, a small ac unit would for sure do the trick. How are your temps now that it's summer?
Weird. I topped my Hawaiian Snow today, and it did the same thing. Right now the leaves are showing a slight nutrient burn (which I've since flushed) if it helps.
I'm growing H.S. now, but it's still vegging. I'll be sure to post some pics when they're flowering. I believe it takes 12 weeks to flower to full maturity. We'll see!
Lookin' good! It really seems like you've done your research. Can't wait to see what you yield. I'm very interested in the SLH. Two year Cannabis Cup Winner, it should be awesome. Good luck and keep up the good work.