Capacitors only smooth out voltage spikes. I run them just on the main battery input, wherever that is. You don’t need 4 on the ESC’s as well.
I would look at getting a cheap carbon frame, the ZMR250 clones are under $15 and are going to be much more rigid than anything printed. That would eliminate vibration from the equation, then you can look at other potential issues.
I would look at getting a cheap carbon frame, the ZMR250 clones are under $15 and are going to be much more rigid than anything printed. That would eliminate vibration from the equation, then you can look at other potential issues.