I run geo with 525 accuracy, but i always run mithrala aura which gives over 600
I actually find level 15 quite challenging, if i manual it (controlling when buffs are used etc) then i am 100% but if i stick it on auto then i have maybe 1 in 5 go wrong, which is a pain.
Yes, I could manual but its not worth the extra 20/40 energy. Just run multi battles and come back and see. I don't think I can get my geo that high without sacrificing too much hp/def.
I think mith and ramantu are only champs i have over 500.