Could we have a picture of them?
I’m not exactly sure what “flimsy” means, but here is some general advice:
Add some washers/spacers to decrease the wiggle room your wing has (if your wings twist)
If your motor doesn’t have enough torque, switch it to a lower cartridge/gear it down and mount the wing on a screw joint
Try to make some mechanism that removes the motor a bit from the force. Here’s an idea (though you’re going to have some wire management issues):
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