Sorry, not buying it. OK.. after re-reading you said lift @ tappet. I hope no one here would think that. The quicker ratio does get the valve to .050 lift sooner and therefore increases @.050 duration.

CAMSHAFT GEOGRAPHY AND LOBE FUNCTION

1) Max Lift or Nose
2) Flank
3) Opening Clearance Ramp
4) Closing Clearance Ramp
5) Base Circle
6) Exhaust Opening Timing Figure
7) Exhaust Closing Timing Figure
8) Intake Opening Timing Figure
9) Intake Closing Timing Figure
10) Intake to Exhaust Lobe Separation