More blue will make the plants bushier and is mainly for veg and red for flowering.
I suggest a little red and max blue during veg and during flowering you should have both maxed out for the extra light.
The leaves, check for PH, I had similar problems and noticed my PH was very acidic, about 5.
It doesn't look like cal mag problems at all but I strongly suggest checking your PH levels.
Just a Q, isn't the light a little too far away from the canopy?
Is it possible having both White and Red leds on at the same time? More light will help getting deeper penetration also the white will supply some red light too. It will consume more watt but may help.
not to be rude or anything, but have you ever tried just put a clone into a glass of water, with or without rooting powder. Since the stem is fully under water it will supply all the water to the rest of the clone, no misting or humiditydome is required. Rooting powder will make the clone root...