I am totally down for a Blue Dream Off.
Mo, SG hit it on the head. I usually take them around 57 - 65 days or so. No longer than 70 days or it gets a burnout that leaves you sleepy. I have one friend that loves them at 56 - 57 days and others that like them around 63 days. These days my BD is pretty consistent since I run the same nutes and such every time.
I dose them with Kool Bloom powder (or MOAB) around week 5 - 6 depending on how far along they look. I use GH 3 part. ( I can share the recipe if anyone wants it) They can handle a lot and are very forgiving. Yours in veg look great. The BD should yield you an elbow per light EASILY.
Did you ever get a good session with that kief? That will give you a good idea of how they are. That kief came off of trim taken at 60- 65 days, I think.