14 sorties, 5 clean kills/S-Ranks, 4 chips(between 17hp to 117hp), 5 retreats(Most intentional, when going south)
Since it was Easy, I just YOLO'd the boss from the start through E-G-J-M-Z, since it's the shortest route tothe boss and seems to be a 100% fixed route, after going to E from Start. Didn't bother specifically going after mini-bosses unless I was routed south, then I tried to kill X and Y. I never managed to get to Y, but did end up clearing X 3 times easily(Type 3 shells weren't required for this, but you probably want to use them if you're going for Y too). It seemed to help, I had some good runs after, but it's not required on Easy if you have good cut-in ships.
Formations to use are pretty self-explanatory. Bottom right for all nodes. Top left if you go south to B(sub node). Some people have had good luck with top right on M node, which theoretically gives and AA defense bonus while still maintaining decent shelling accuracy.