not only will 2:1 be hard to filter as @cannabuilder points out, you would likely also drop cannabinoids at -80C (which is where your dry ice bath will get you).
somewhere between 5:1 and 10:1 is a safer range to winterize. Ethanol Ratio During Winterization - #2 by Future
@elgallonegro what was your head temp and Vac level?
@TrillOrganics I don’t understand how a vac leak could cause distillate in the cold trap.
at least not with the mantle at 210C.
can you enlighten me? (no experience with leaking glass 
)