Good morning, Vernanas.
- Right about the comparative of adverb, μεῖζον is comparative of μέγας, big, great.
- There are many ways to skin a cat. I only corrected the gender/case of the noun and participle you used. It would mean “showing slavery”. You may want to consult the English-Greek dictionaries listed in the pinned thread to choose the most idiomatic.
- In Attic monosyllabic -εω verbs only contract with ε.
- Yes, optative could be used. I am uncertain whether to use ἄν with it (polite command), or not (wish).