For some reason this has been stuck in my mind and I finally figured out why. 227/200 is extremely close to 17/15. XL Timing belt pulleys often come with 17 or 15 teeth and GT2 belt pulleys often come with 34 and 30 teeth. I would wager that the numbers you have in firmware are for a 15 or 30 tooth pulley and you actually have a 17 or 34 tooth pulley. If so, just multiply DEFAULT_AXIS_STEPS_PER_UNIT by 15/17 and you will be perfect.
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