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Thanks for posting pictures! I'm really happy we found a solution.
Just be careful with nylon nuts. They will help with friction, but as every plastics parts they will wear off after some time. Don't have personal experience with them, so can't tell how soon it will come and it will also depend on precision and smoothness of the thread on the M5 rods. If normal nuts are working for you now, there is probably no reason to change them any more because you probably hit the limit of your motors. But if you would like to experiment, I will be happy to hear about the results you achieved.