Comparing MCH damage/potency to turret damage/potency is not a correct merit for determining potency.

So that 86 potency per AA value is most likely wrong.

Hotshot - 27773 damage
http://i.imgur.com/nH3ttq5.png

AA - 17690
http://i.imgur.com/p6p6fyG.png

Excluding the 8 crits from the hotshot parse and 5 crits from AA damage to get non crit averages

Hot shot - 20701 damage:591 average

AAs - 15104 damage:359 average

AA in this case is ~60.7 % of hotshot potency making it an average of 72 potency. You'll probably get more accurate values if you draw out the parse but it's easier to exlude and manually calculate noncrit averages if you do ~50 hit parses.