either way, if you really want to save, do the first pull of 20ml, while that pull is in the freeze do the next one(let it sit with the soup while the first one is freezing), then when you have collected the DMT from the pull in the freezer, make the second pull, freeze that.
Then use the naptha from the first pull for the third pull and so on........
Also, when doing the freeze precip, make sure the naptha is supersaturated, so after you make the pull from the soup give it a gentle blow, if it clouds up then freeze, if not evap it till it gets cloudy.