Degreeing at 0.006" tappet lift is veeeeeeeeeeery unreliable because you are on the clearance ramps of the lobe, where you get a lot of movement [ rotation ] for a few degrees. This is why the 050 numbers are provided because you are on the flanks of the lobe & it is more accurate.
Where are you seeing the .050" numbers on this cam card? I am only seeing the duration specified at those heights, not where the opening and closing .050" are in relation to degrees.