Degreeing a Cam Shaft

Okay so when I took the degrees at the .050" lift, found the duration, took the duration and devided that by 2, and add that to my .050" opening I was getting 107 for the centerline, which is wrong, the card says 109 degrees. So I moved the crank sprocket to the 2A position, lined up the corresponding 2A mark with the "O" mark on the cam gear and found TDC again. I decided to mark down the degrees at .050", 100" and .150" lift and I got the following information:

@ .050" lift - opens at 2 BTDC, closes at 40 ABDC (matches the cam card)
@ .100" lift - opens at 28 ATDC, closes at 9 ABDC
@ .150" lift - opens at 62 ATDC, closes at 155 ATDC

The duration between the opening and closing lift points:

@ .050" lift - 222 (matches the cam card)
@ .100" lift - 161
@ .150" lift - 93

The centerline according to those lift measurement points:
.050" lift - 109 (matches the cam card)
.100" lift - 108.5
.150" lift - 108.5

Id say I got it!! thank you for all your help and sticking with me through this! and again I apologize for my misunderstanding.