being a self established conaseur of cracks, i can help you out a little... you have established a nice form of placement, now use the negative space wihin the actual crack to make the letters look bigger, or fill them with actual surface, as in the fill of the actual letter, and surround those areas by closing them in a little with smaller pieces and particles, as if the letter were actually crumbling, for that is in essence the goal of cracks in letters; creating the feeling that a strong letter structure is so fresh, its actually destroying itself.
keep up the good work makr... shit looks proper!
ps:
DM!, you can officially stop giving any advice dude.