Pretty skinny ground and power tracks - if you don't mind me saying!
I tend to reserve the underside of the board for a ground plane and thick power track only. I do put the occassional other track on the underside as well - but only when necessary.
Try putting a small tantalum (4.7uF or 10uF) directly across the micro power pins. And perhaps replace the small electros with tantalums to see if that helps. Also try a Tantalum on the output of the regulator instead of an electro.
Alan
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