I just did a very small sample size while waiting for my group to start up for Garuda Ex.

with 341 acc (natural accuracy)

Frontal - 300 swings, 285 hits. 95% connection rate
Side - 300 swings, 300 hits. 100% connection rate



Now obviously i cant test rear since it seems 341 acc is capped for flank so we would have to test on an actual boss just being tank and spanked.