I've never done Cybs tek, although it's definitely a proven tek in terms of it yielding great.
The only thing I could think of is if the total volume of all your pulls weren't evaporated down sufficiently enough before sticking them in the freezer then I could see that being a potential issue. Just speaking in general here, but if your total combined pulls in the collection dish aren't 'milky' or very 'opaque' - then that's a good indicator that the total volume needs evaporated down more before sticking the dish in the freezer.
The total volume of pulls needs to be saturated [milky] before sticking in the freezer ime, otherwise the likelyhood of all the freebase dmt to crash out is on the lower end, and everything that's in there will not crash out.
I usually evaporate the total volume of all my pulls - down to a 1/3 of the total volume or so, otherwise the xtal formation in the freezer has the potential of being much lower ime. Think of it as - you keep evaporating the total volume down - you're in a sense continually 'backing the dmt xtals into a corner' so to speak, giving them less space/volume to be dissolute, then given with the really cold temps - this combination causes them to crash out. On the flip side if you don't evaporate the total volume down ..then they have more space to 'hide out' insolution.

Also, another important thing is to make sure the non polar solvent is mixed thoroughly throughout the base mix, otherwise the potential for it to pick up near-all of the dmt freebase is lessened ime. I usually mix thoroughly, let it separate, then repeat this process a few more times just to be sure I picked everything up; then I pull it off after its fully settled.
** also, ime it's important to have some sort of airtight top/lid/covering on the dish, in order to not allow any water/or anything from the freezer to seep into the dish.
***Also I noticed you used acrb, and that in itself can have variability in alk levels ime, relative to what's extracted from mhrb.