Magnum 380HP Camshaft

I haven't dialed a cam in 15 or 20 years, but as I recall you don't dial it to the 0.050 specs. You dial it to the centerline of the lobe versus the TDC of #1 compression stroke. You find the centerline of the lobe by splitting the degrees you read off the degree wheel at a (somewhat random)convenient chosen lift each side of the lobe nose.
For MP cams they have a given recommended C/L number to shoot for.
Ok, re-read your OP. Yeah, you're doing it ok, if I understand you correctly. The trouble you're having is trying to generate their "mythical" numbers. I don't think that is a realistic thing to do. I never tried that, I just used the lift to identify the MP cam, and then went by their C/L recommendation.