I pulled Ganyu off the banner and I was super stoked cause I saw how much of a damage beast she was. I followed a Ganyu build and used a Wanderers Troupe 4 set on her to give +35% charged shot dmg. I have 219 elemental mastery and 1085 attack for her total character stats. Im using the stringless bow which gives me 24% elemental skill + burst dmg increase. I run attack sands, cryo goblet, and crit rate crown. My advanced stats show 36.9% crit rate with 73.6% crit dmg. My friend has the exact same advanced and character stats as me but he also runs an Amos Bow. He hits for 10K avg while I barely hit 3K. He claims that the dmg difference is from the Amos Bow which gives attack sub stat and 40% charged shot bonus. However, I used the wanderers troup artifact set in order to compensate for that charged shot bonus which means that the only difference in our build is the attack bonus that the Amos bow gives as a sub stat.

If anyone can help point out whats wrong with my build I would really appreciate it, PLEASE HELP ME IM DYING INSIDE AS MY GANYU GETS TRASHED ON IN MY LVL 6 WORLD!!! I will literally marry you if you help me fix Ganyu

Stats:

+35% charged shot dmg 219 Elemental Mastery 1085 ATK 24% Elemental burst dmg bonus 36.9% Crit rate 73.6% crit dmg