Sounds like the growing environment is right but that you may be overwatering your maple. The margins of the leaves can turn crispy due to wind, overexposure to sun, too much fertilizer or soggy soil. Since you've eliminated most of these conditions, I'd say that you're watering too frequently. Try watering thoroughly, making sure that excess water drains out of the drainage holes of the container, then allowing the top half inch of soil to dry out. You can stick your finger or a pencil into the soil prior to watering again. If the pencil comes out with soil attached, or if the soil feels moist an inch below the surface, you won't need to water for a few days. If the soil is dry (and the pencil comes out dry), it's time to water. Best wishes with your maple!
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