Heya, michelem.
Don't know if you or anybody else knows. Minera calculate HW percentages wrong.
By calculator.
HW Error / AC * 100 = The correct percentage.
Minera
Dunno how minera calculates hw percentages but its wrong.
Minera shows 8.07% but indeed the correct percentage is 8.84%.
http://i.imgur.com/B48T1nZ.jpg