I bought the Volcano about 3 years ago and had similar problems getting stoned. However, I did not read the instructions and put the thing away. Maybe I'll take it out and try it again.

I never ground up the bud before putting it into the Volcano.
I never put the chamber on without the bag
I never had the chamber on alone and turned it on with the weed
in the chamber, letting it "breathe" for a few seconds seeing the
"THC" start coming out and then put the bag on.

I'll try it this way and report back
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If GOD wanted us to be vegetarians, HE wouldn't have made
animals outta meat.