I'd keep a consistent light schedule through the cloning process personally.
I only use heat mats in winter if room temp is low, otherwise the possibility of fungus increases
CLEAN your tray and dome with foaming cleanser before use too
Mist only the hood, not the plants
Only open the vent a little ways -just a CRACK- at first

Another thing to think about is treating with wilt-pruf. You can even wilt-pruf your moms BEFORE you take cuttings off them. Or you can mist the clones. The point is to make them less prone to losing water through the leaves. I cut my leaves down to 1" as well. Don't over do the wilt-pruf; it can suffocate the plants if overapplied.