Categories for governments to reflect: Really only three points I'd like to visit there;
Anarchy, Chiefdom, and Despotism are governments designed to be worse than the others and as such don't need any part being more powerful than other governments. If you are going to make Despotism the strongest government for Military (Units and building) then you should also have no Civic City Limits on it. If you do then strongest Military should be moved to one that does not have City Limits.
Democracy and Republic should have their strengths switched. Democracy more cultural and Republic more commercial. I also would want to suggest having Republic's strength being

rather than

as

can be used for anything with the sliders making any commercial government strong in any field and not just for commerce.
Rather than having all governments have a single strong point I would like to see only 4 or 5 of them "specialized" in a single field; Despotism (Military, if no City Limits on it, and

), Republic

gold

, Democracy

culture

, Totalitarianism

hammers

, and Technocracy

science

.
The rest should be a mix with a few parts a little stronger but not near as strong as the specialized ones, and possibly fewer cons. You have that with Monarchy and it's +5% across the board already but I think it would be good to have that with Theocracy as well where State Religion is present, and -5% on all for every non-State Religion present in a city, if that is possible to set up that is.
Monarchy:
Looks good to me except for one thing; if you want it to have the
least maintenance then +30% to all aspects is quite a lot. I'd set the number of cities at +10%, remove the distance, and reduce Overseas to -25% instead. That way the monarchy's colonization is covered as Monarchy would be the easiest to have far-flung colonies overseas with (using the classic Governor to rule them) while keeping the larger core cities at a normal maintenance cost. For this end there should also
not be any City Limits from this Government as that would be contrary to colonization and expansion.
I would, because of Knights and the idolization of them, also add increased Great General appearance.
Republic:
With the -15% Distance and +25% number of cities maintenance you have it at cheaper to keep than Monarchy with City Maintenance. I can't read what the Civic Cost is from your post though so it might be that Republic costs more in Civic Cost. With the amount of Civics in the game though a single Civic costing more is only a small part of the whole and with the same other Civics you still come out cheaper with Republic than Monarchy. Keeping with having Monarchy cheaper in City Maintenances I would set Monarchy as I wrote above and keep Republic with your suggestion of -15% and +25%.
I'm not sure how much commerce you were planning to have on Democracy. Without seeing that it's hard to comment on how much +%

Republic should have in my opinion, as per my wanting Republic and Democracy switching strengths. +15%

in Capital and +10%

in all cities might be good though, and reduce or remove the increase in

.
Theocracy:
I would like to see more benefits from having a State Religion and more penalties from having more religions at all. The ability to do Inquisitions should also be a part of the government I think as should the no spreading of non-State Religions.
I would love to see it slightly stronger than Monarchy in all things except City Maintenances when only having the State Religion in a city, but having that bonus reduced by every other religion present in the whole nation. Starting with +10% across the board and +20%

, reduced by 5% for every other religion in the whole nation. Nearly as strong as specialized governments but in everything when having a single religion present.
All in all when it comes to City Maintenances I would rather see the penalties toned down to the point where the cheapest ones have -% in city maintenances rather than less +% and instead increase Base City Maintenances to make up for the "loss" from reducing Civic City Maintenances. This is for all Civic Categories that you have increased City Maintenances for, not just Government Civics.
That is it for now.
Cheers