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Don't put too much emphasis on going precisely ATG. Your best angle might be...

20 degrees from true ATG. Or,
20 degrees from true ATG, but with a slight scything motion. Or,
20 degrees...

WTG, XTG & ATG are useful concepts, making it easier to understand the concept of pass directions. In your case, I think you need to temporarily forget about WTG, XTG and ATG. Rather, approach it...