I have achieved as high as 58% CBD with floraplex thickener and just a touch of mother added to the isolate to get THC concentration to .22%. I was trying to hit 50% but miscalculated how much CBD was in the mother. 500 carts in that batch, not one return. I found a half vaped cart in my sock drawer from that batch the other day as well, zero crystallization. Though I will say, my experiment at 60% straight isolate sugared up in 2 days.