Hi Daihashi! Thanks for sharing! Yeah, the 'head' effect surprised me too- I was expecting all 'body' but the warm tingly feeling was about it- pleasant, but not debilitating. I also find that a sub-recreational dose keeps me very focused at work, despite feeling NO 'high' effect at all.
Thermal shock sucks. Always put your glass down on potholders- hot liquid + cold surface = cracking. Even mason jars do it if the difference is great enough.
As for the schwag ratio, if you collect shake for cooking, it should be pretty close. 2 grams per tablespoon butter is easy to work with. Take out seeds; they don't count as bud weight. I've been buying shake cheap from a couple folks who go through a lot of brick. It's very nice to work with.