Our poly proposals this round, mine included, all kind of miss the point with this civ. The way to play poly optimally is to really farm the ruins and barbs hard, and sail around sniping the best ocean/coast city spots that DO NOT upset the other AI (too much). The AI just doesn't play the city founding aspect of this civ correctly. From there you must develop each position into a defendable configuration which can be very challenging if they're very far apart. Another AI weakness, especially around water.
Others have suggested a war focus throughout early founding stage is also beneficial, quick strikes with lots of pillaging and demanding tribute etc. AI doesn't really specialize its war analysis into this raider-only style. AI just does not do what makes poly excel. Our yield tweaks and unit tweaks are kinda tangential to the real issue with this civ.
Anyway everything here looks fun, if maybe not completely necessary... I am not in love with the idea of muc poly getting a UU warship, as was floated in other threads, so I'm okay with sticking to status quo as the current mix with MUC feels pretty good tbh