I'm just getting ready to do mine so went and checked what mine looks like. What are you measuring from to get the rear at 5.06xxx? The frame rail is not as wide as the subframe connector so it's going to be different if you are measuring from the frame rail which is 1.5 inches wide.
For comparison I have 5.5 from the frame rail to the pinchweld at the at the front of the frame rail. The connector is 3 inches wide so 3 minus 1.5 is 1.5. Divide that by 2 is 3/4. 5.5 minus 3/4 puts me on the money for the rear location centered on the frame rail. I think the reference measurement to the pinchweld in the rear is to keep is straight on the floor going up to the subframe. If you have something different I would do what you need to so that the connector is parallel to the floor pan reinforcement ribs for aesthetics, but I'm not claiming to be an expert on the topic either.
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