Originally Posted by
Baroncognito
I don't think that you're calculating AC correctly. The Monk text says "the monk adds his Wisdom bonus (if any)" and if we compare that to the text on Longbow, for example, "If you have a penalty for low Strength, apply it to damage rolls when you use a longbow. You can apply your Strength modifier to damage rolls when you use a composite longbow, but not a regular longbow."
If it says "A Monk adds his Wisdom Modifier" then I'd agree that yes, your calculations were fine, but from a straight reading of the text, you only get your wisdom modifier to AC if it's positive.