Sounds like you need some mini humidity meters. They are really cheap. No need to burp unless humidity is too high. Once it stabilizes at a safe level you need to stop burping. Bovada humidipaks (58% or 62% depending on preference) are great for long term storage. Cvault storage containers are a bit pricey but are best for real long term storage. I have 3 year old weed that still smokes perfectly. So far 3 years is as long as it's been held before smoking but I image it would past much longer if stored correctly.
Never heard of storing in mylar so i cannot comment on that. When i used to purchase my weed it mostly came in double wrapped vacuum packed food plastic and i could still smell it through the plastic which implies it is not being stored correctly.
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