You can try putting the two motors on the same vertical axle, and not the inverted motor on top of the first motor.
At least I did this a few times, I'm not sure it will help for your design.
In the following image : pure art
Red is the vertical axis, static.
Blue is the motor 1. Attached to red.
Green is the inverted motor, attached to red.
You can try putting the two motors on the same vertical axle, and not the inverted motor on top of the first motor.
At least I did this a few times, I'm not sure it will help for your design.
In the following image :
pure art
Red is the vertical axis, static.
Blue is the motor 1. Attached to red.
Green is the inverted motor, attached to red.