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You don't have to collect extract while depressurizing. When you extract in a system that uses traditional distillation over of rapid pressure changes in a "separator".
These "separators" were designed for the separation of solids from a…
Water cooling at those low temperatures would be expensive and wasteful. Direct refrigeration with r744 or another Freon based cooling is needed to keep such low temperatures for the duration of a extraction cycle.
1250 psi is your problem, you are well past critical pressure. This is a sub critical extraction because you are past the critical pressure but below the critical temperature.
If you want a terpene extraction from your Hi-Flo I would suggest …