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You should have the your body positioned at the same position, relative to the BB. If I have two bikes with the same saddle, just drop a plumb bob from the saddle nose and measure how far back it is from the crank center line.
If something feels off after that, then it's the reach or drop that need changing.
If you have your body too far forward, which will probably be the case with a zero setback post, you should feel too much weight on your hands.
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