Lookin’ good @Rcalhoun92! Nice to see you taking the first steps and moving forward with everything! A few questions: 1. Has the product been decarbed? 2. How does it smell? (And do you care, as it seems likely you are going to be adding terps?)
If the product has not been decarbed, that is something that should be done prior to getting it into a pen, lest you want unconsumable diamonds in there (which I don’t suggest). Dewaxing and degumming makes for a better pen product, and I have no idea if you removed enough of them at that higher freezer temp after a warm ethanol extraction.
I agree with everything that @cyclopath says. Taste can supercede color. I care, personally, more about what a pen tastes like over how it looks (although I do really like it when it looks pretty and tastes good too!) I would avoid the roto, as you will lose more to transfer loss than it looks like you can afford to with that small extraction.
As for the “why do it cold” question, I agree that it is a decision to be critically examined by the company doing the work and paying for said labor and consumables, but my personal opinion is that the better job of extracting one does, the less work and cost for a higher quality product is needed. If doing the extraction at cryo temps makes it so one has less to do to make the best product, seems to be a logical course of action. If you have any desire to preserve terpenes in your extraction, cryo is the only way to go. If not, keeping the ethanol warm will save you some time in removing the terps down the line in your processes, but it will make you work harder to remove all of the other undesirables. Filtration can be a rather troublesome bottleneck…