@Briefvoice assuming absolute min for all home sectors, keeping some forces as part of the Anti-syndicate task force, and not too far over defense on the KBZ and RBZ what can we free up for conflict in the GBZ, SBZ and CBZ? If we can look at that I think we can get a better idea of needs.
You understand this is a really complicated question, but... Let's look at 2313.Q2. I estimate that this is when Apinae sector will requiring garrisoning, which I assume will require D12. That's based on the "standard" D9 plus and extra D3 for having two member worlds. Assuming that we follow my suggestion and only have two Miranda-As out for refit in 2313.Q2, our available forces will be:
6 Miranda (2 others in refit)
2 Miranda-A (back from refit)
7 Centaur-A
5 Oberths (this includes the T'Mir, which will be back from its overdue refits)
7 Constitution-Bs
7 Constellations
1 Constitution-A
11 Excelsiors (5 of them in Exploration Corps and unavailable for garrison duty)
Here is my projected minimum (or near minimum) for all sectors that are not the CBZ, SBZ, or GBZ.
Sol Sector – Requires D18
Q2 2313 - 1 Constitution-B (5) [Hood], 1 Centaur-A (3) [Zephyr], 2 Constellation [Selaya, Stalwart] (6), Starbase 1 (5) = 18D
Vulcan Sector – Requires D12
Q2 2313 – 1 Constitution-B (5) [Unnamed SF build], 1 Miranda (2) [Thunderhead], Starbase I (5) = 12D
Andor Sector – Requires D9
Q2 2313 - 1 Constellation (3) [Docana], Oberth (1) [Suvek], Starbase I (5) = 9D
Tellar Sector – Requires D9
Q2 2313 - 1 Centaur-A (3) [Bull], Starbase I (5), Extra Outposts (5) = 13D
Note: I don't think we want to leave any sector with no ship at all.
Amarkia Sector – Requires D15
Q2 2313 - 2 Centaur-A (6) [Blizzard, Lightning], Starbase I (5), Extra Outposts (5) = 16D
Ferasa Sector – Requires D15
Q2 2313 - 1 Excelsior (6) [Avandar], 1 Constitution-A (5) [Cheron], Starbase I (5) = 16D
Rigel Sector – Requires D9
Q2 2313 - 1 Constellation (3) [Kearsage], 1 Oberth (1) [T'Mir], Starbase I (5) = 9D
Apinae Sector – Assumed to Require D12 as of 2313.Q2
Q2 2313 - 1 Constellation (3) [Vigour], 1 Centaur-A (3) [Gale], Starbase I (5) [Grand Hive of Apinae], Extra Outposts (5) = 16D
Romulan Border Zone – Requires D12
Q2 2313 - 1 Excelsior (6) [Excelsior], 1 Miranda-A (2) [Shield], Oberth [Hawking] (1), Starbase I (5) = 14D
Klingon Border Zone – Requires D6
Q2 2313 - 1 Excelsior (6) [Thirishar], 1 Miranda (2) [T'Kumbra], 1 Oberth (1) [Inspire] = D9.
Anti-Syndicate Task Force – No fixed Requirement
Q2 2313 – 1 Constitution-B [Lexington], 2 Constellations [Sappho, Challorn] (3), 1 Oberth (1) [Torbriel]
Okay, so for the Cardassian Border Zone, the Sydraxian Border Zone, and the Gabriel Border Zone that leaves:
3 Excelsiors
4 Constitution-Bs
2 Centaur-A
4 Mirandas (reduce this if you want to have more than 2 refits in progress)
1 Miranda-A
Note that the CBZ and the SBZ both have a Starbase. Does this help?
One thing on the Centaur-A vs Miranda-A is that Miranda is cost optimized for offensive operations, Centaur-A does better for peacetime and garrison. We need three Mirandas to cover the same defense requirement as Centaur-A.
Miranda-As have D2 and Centaur-As D3. You need 3 Mirandas to cover the same defense as 2 Centaurs, so it's not as bad as you're thinking.
2312-
BR: 710 (EOY 2311) + 25 (mining colony) + ? (Qolathi) =735 + Qolathi
SR: 460 (EOY 2311) + 15 (mining colony) + ? Qolathi + 25 (tech increasing SR colonies by 5) = 500 +Qolathi
I have the mining colony increases factored in, but not the Qolathi.
2313-
BR:735+Q + Indorian + Apiata=735+Q+I+A
SR:500+Q + 20 (mining colony) + Indorian + Apiata =520+Q+I+A
I have all this factored in, though admittedly the exact quantity of I + A income is a guess.