sounds like u found the good stuff I would have to say no its not mold, some potent strains will have exactly what u describe. Mold is pretty easy to spot when u know what to look for, its more of a flat white, then the glistening crystals normally found on the inside. I've cracked some serious buds appart before and there's nothing like finding a serious amount of tricomes on the inside. If the bud is dense and really good, its probably just the mass of tri's it produced. do a google search for mold and marijuana and ull get some pics and decide for urself.