Ran a single test bag of fresh frozen from a top tier cultivator. 70/30 blended gas. Different strains from the same source (same facility) produced exceptional extract. This ended up smelling nearly identical to the smell that you get when sniffing a vial of steam distilled terps. Theory is that at some point post-harvest, the material thawed out, and now a bunch of undesirable molecules leeched into the extract.
When you use Ln2 to freeze flower you have no ice crystals form. When you deep freeze two things happen. First is the formation of ice crystals which destroy cells as they form. The second is encapsulation of thrichs by ice. When you run your FF thats been deep frozen your running cold solvent. This keeps the desirables locked in ice and restults in a low yeild(5%).
Where Ln2 frozen material has no degradation from ice crystals and the desirables are free to be extracted by your solvent.
Yeild stays in the 10-20% range on Ln2 frozen material. This is the reason you got such a deal on your deep frozen.