Degreeing a Cam, or not.....

Here is what I have found. I used the TDC tool and My TDC lines up correctly with the 0 on the Balancer/Dampener. When I measure the degrees at .050 tappet lift, (.075 spring retainer lift since I have 1.5 ratio rockers), I have the opening at 4.5* btdc and it should be 15*btdc as measured on the dampener. The closing mark at .050 tappet lift is at 57.5*ABDC not 51*. Thinking I may have a flattened lobe I checked the LIFT of the spring retainer. I got .492 on the intakes of cylinder 1 and 5, Should be .517 inch. Exhaust was .502, should be .537 on #1 cylinder. Also thinking that my dial gauge may be off I measured a drill bit with calipers at .481 and then measured the dial lift and it was bang on. I am confused by this. Wrong cam?
You cannot do it that way. The timing specs are based on tappet lift, NOT valve lift and you cannot figure it mathematically because you dont know your actual rocker ratio, not to mention your geometry will effect rocker ratio