Sir, oils are same, manufactured in the same facility, at the same time.
Same oil is filling the 10ml vials and also the 1ml amps.
We have a computerized and automatic filling line. Amps are a recent addition to our line so probably the machine wasn't properly calibrated for filling with the proper quantity.
0.1/0.2 errors may indeed occur, but they are rare. Also, I guess those which are overfilled which apply for the MOST, were never reported.
Amps price was already explained, they ship slower straight from the production facility and it will take up to 2-3 weeks to receive.