I haven't actually been able to 'max' out a plumbot yet, but I have improved them using Tune Up, so perhaps that is the way it's done. It hasn't worked for me yet, but maybe it's just been bad luck. I don't know of any other way to improve them other then with Tune Up.
just keep spamming tune-ups, eventually it will be 10.
also, tune-ups seems to be the best way to gain skill, at least based on my experience it was a hell lot faster than researching trait chips or nanites
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Maybe with better trait skills, or with better bot building skill.
also, tune-ups seems to be the best way to gain skill, at least based on my experience it was a hell lot faster than researching trait chips or nanites