I've made several end grain cutting boards from excess / scrap lumber. The last two were cherry and maple. Both of these two got 3-4 heavy coats of mineral oil and 2 coats of the cutting board conditioner (assuming beeswax and mineral oil blend). Both looked great, but warped substantially and even showed some cracks pretty quickly. Neither was from the very end of the boards with any obvious checking, though that could have played a role and I missed it.
Is there anything else you do with these kinds of boards that see heavy use to keep them from warping / checking / cracking?