formation 1: Maim purposethis is the best way to full use of shu's main trait, which is Maim. The main hero here actually is Huang Yueying, because she can apply maim to all of the enemy very fast with her ultimate skill (2nd skill) in 2nd round. from my experience HYY is the fastest ulti caster after Ma Chao (machao can even cast it in 1st round but need a certain setup, which is his counterattack activated and no tremble on him). In spite of this, if you are lucky, in 1st round jiangwei apply lock and guanyu maim it in the end. zhugeliang is there to maintain the enemy still have lock and maim till the fight is over, and with his revive, it makes his survivability better. from here on, shu team can wreak havoc with enemy cant cast ulti.note: main hitter is guanyu
formation 2: All purposeIf you are a big fan of Jiangwei, this is the best option. With him being a physical type, its obvious that his weakness is magic type, and to make it worse, most of magic hitter will be placed in the back. so you have to combine caiwenji and xunyu skill to make sure jiangwei 3rd skill can do the highest possible damage. the placement of xunyu and caiwenji is a bit complicated. if the enemy in the middle dont have crowd control ability, you can put xunyu in the middle so you can cast jiangwei ulti faster. on the contrary, cai wenji should be placed in the middle so xunyu 3rd skill wont be disturbed.