break up your weed better and keep it even in the paper. Take a little time to make sure its as even as possible. If there are parts of the blunt wehre there is less weed then the paper will burn faster than the weed. I dunno about using a microwave, ive neva tried it, nor heard of anyone using it (except via the internet). There should be no need to use the microwave if you just roll your blunts proper.