Hello John,
None of these calculators takes into account the action of the ESC's RPM governor. For "normal" RC-type wide open throttle running, the staic current will be anywhere from just above the same to 10% or 20% higher under static conditions than in a verical climb at flying speed ... but the governor completely changes the picture.
The governor changes the "throttle" in order to maintain PRM, so that the current on the ground is often 130% or 140% as much as in level flight at the same RPM.
When you use the calculator, do you assume the full battery voltage? I'll bet you do, but the ESC/governor is probably only applying 75% to 85% of the battery voltage. There's your big difference.
Hope that helps,
Dean P.