I have also ran 600mg a day pressed tabs powder dnp during the summer in the south working mostly outside. It sucked but i lost a pound a day for 30 days and ever since then i have only been able to get crystal and never gotten close to the same results. Although on the crystal i only went up to 350 per day and I could easily tell the next morning it was mostly out of my system and not effective. So I actually think crystal could possibly be cycled but i feel it is a waste because you will have some amount in your system since it takes around (for me) up to 8 days to clear and drop all the water weight. Hope this helps

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