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Ummmm... Try pouring a 2" thick countertop. If that's not what you wanted to hear, enjoy those cracks.

Sorry, that was rude.

Let's try again. Cracks and countertops go hand in hand if you do not have the proper mix design. The way you are currently doing it, although easier, still allows for a certain amount of flex. ie a fat brother-in-law sitting on the new counter, and ta da, you have hair line cracks, or worse. Try adding some CPR 1000 to our TP, MF, TF. it already has it in it, so DO NOT use very much. A little goes a really long way in helping the counters get really hard. I would suggest 1/2 qt per bag. Now this is not to be done on floors. Floors are a different animal and there is no need to reinvent the best wheel on the market.

You can also try adding Polyprop. fibers to the TP. Again just a few, and then apply your TF and Micro coats over that. This will also help with the cracks.

Finally, you better be pulling that micro thinner then a piece of paper. It's not meant to be build up at all and if you do... more cracks. Keep it thin.

Like I said, IMO precast is the way to go. If you don't want to mess with all that, then you need to modify what you are doing. These are counters, not floors, and they require a different approach.

Good luck bro