i’m going to be all crazy and controversial and that and suggest it may be the bottom screw on the front mech and the point at which the chain gets shifted down to smaller rings
i’ve found that if you set the front mech so it only just nudges the chain down, maybe with a bit of rubbing before it drops, it is more liekly to chainsuck. try setting it so it’s a clean push down. (i hope that makes sense!)