Frontal accuracy cap for A8S is actually 705 out of tank stance. The 723 people are referring to was an initial estimate based on a Gordias to Midas projection. I would recommend aiming for the accuracy cap out of tank stance for both tanks since there are times when the offtank will need to hit from the front and there is no reason the main tank needs to stay in their tank stance for the entirety of the fight (especially the first phases).