The lesser quality herb could have something to do with #4s lack of response. Your never really sure about these things.

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 could the problems with the shit oven be counteracted by using a microwave?t? 
I have de-carbed, re-hydrated, cooked firecrackers, and set weed on fire in 20 seconds with a microwave. Sounds like you doing fine since you got that stoned.

If you can afford it make it with the best weed you can afford, then your questions about the HQ will be answered. Higher quality is always higher quality.

Keep experimenting and report back. What a fun scientific experiment.