Are you even using a GC man?
This would be one of the reasons for getting in-house analytics early rather than late.
It’s much easier to understand the amount of variance in your input when you can run as many samples as you want to. You can (for instance) go grab a branch and test several flowers to assess variability. Blew my mind the first time I did that and had 20+% at the tip and less than 10% on the bottom. most of those buds would have ended up in the same bin…
If you really want to assess inter/intra lab variability you need your test samples to be as similar as possible (homogeneous).
I recommend this implement… Biomass Grinding at various scales? - #22 by cyclopath