0 vs 0.04 is a non-issue.
on the 8.3 blade is it 8.3 positive and negative?
Are you measuring both blades from the same location (out front, rotor inline with the tail, rotating the rotor around to measure each blade)? Given the specificity of your measurements I'm assuming a digital gauge. Make sure you are measuring from the same spot in the rotor disc for each blade. You can't measure one on the front and then move the gauge to the rear blade, the reference zero will change and give you screwy results.