If anyone is interested in the accuracy cap for all 3 extreme primals it is somewhere as low as 447. I did not miss once after hours of Garuda, Titan and Ifrit.

At least 2 hours of each extreme primal and 0 misses @ 447 accuracy, my accuracy was only that low due to recently getting the Allagan spear and still having never seen the Allagan pants or purchased myth helm.

Going to push my luck Monday and try t1-5 with 468 accuracy with food and see how that goes lol, I've recorded 0 misses @ 475 through all phases of Twintania so it should be interesting.