Hey! I can probably help here.
For #1 I would just say to make sure bearings are aligned with metal and with each other for minimal friction. Like @Ethan5956F said you can use lubricant if you want to.
For #2, IMO the 200 RPM motors are pretty essential to having enough torque to open the intakes (depending on goal tightness and intake roller material). Also note that the amount of strength required to open the rollers is proportional to the distance from the outermost roller to the axis of rotation. (i.e. longer rollers take more torque to open).
Because of the high amount of torque on the main axle, its probably a good idea to use a high strength axle there, especially with longer rollers. Let me know if you have an issues in the future!