OK, Battlefleet Bakka post Circe:
Retribution Class BB (as BG:R)
Victory Class BB (new profile – see below)
Vanquisher Class BB (as is, but 20cm) 300pts
Invincible Class BCH (new profile – see below) 315pts
Dominion Class BC (as is)
Mercury Class BC (tweaked special rule wording, torps free swap) 245pts
Armageddon Class BC (as is)
Gothic Class BC (4L@30cm Broadside, 2L@60cm Dorsal) 215pts
Dominator Class CA (as is)
Tyrant Class CA (as is)
Lunar Class CA (as is)
Gothic Class CA (as is)
Endeavour Class CL, Endurance Class CL, Defiant Class CVE (as per BFG:R)
Dauntless Class CL (as is)
Siluria Class CL (4 hits, no dorsal, only counts as half a cruiser towards taking BCs and BBs) 75pts
Falchion Class Frigate (as per BFG:R)
Firedagger Class Flak Frigate (tweaked profile – see below)
Havoc Class Frigate 35pts (as is)
Viper Class Missile Destroyer (as is)
Victory Class Battleship
As is, it's similar to an unfixed Retribution, and not physically easy to distinguish from the Apocalypse. It only barely outguns the Vanquisher, and then only at range, whilst the unfixed Retribution trades 1 lance for double the battery firepower. This Bakka list would already have a cheap BB and BCH for both Linebreaker and ranged roles, so there isn't much of a niche in the low price bracket. Nevertheless, option one is:
As is, for about 330-335pts.
The remaining options require doing something radical to boost the power. If we decide S4 Broadsides are the most important part of the ship, we're pretty much stuck with maximising the focus firepower to compensate, and we need to do something with the Prow/Dorsals:
Broadsides: S4L@60cm
Dorsals: S3L@60cm OR FP9WBs@60cm.
Prow: FP9WBs@60cm L/F/R
With the WB Dorsals it would match the Apoc on Braodside Focus, but would be much weaker surrounded, so probably about 355pts. With Lance Dorsals, it will outgun an Apocalypse on Focus, whilst still being much weaker overall. Probably around 365pts and will need the Power Fluctuations Rule as well.
Option 3 keeps the NC Prow, but in that case the Broadsides have to change. In this case there's a fair bit more variability; not represented on an IN BB so far are:
3LBs - Nemesis Fleet Carrier, never going to happen.
2LBs & 1 L - Lance Carrier - still not in keeping with bakka
1LB & 2WBs
1LB & 2L
2WBs & 1L
So we have 3 options. 1LB&2L keeps it closest to what it is at the moment. 2WB&1L is the only remaining pure gun option.
So let's have some debate! Option 1, Option 2, or Option 3a,3b or 3c?
Invincible/Inflexible Class Heavy Battlecruiser 320pts
Battleship12 Shields 2 Speed 25 Turns45 AV6+/5+ Turrets2
Prow Torps S6 F
Dorsal Lances S3@60cm L/F/R
Port/SB WBs FP15@60cm L/R
Special Rules: May not CTNH, suffers critical hits on a 5+, and suffers +1 modifier to rolls on the critical hits chart.
Firedagger Class Flak Frigate 30pts
Escort1 Shields1 Speed25 Turns90 Av5+ Turrets2
Prow WBs FP2@30cm L/F/R
Special Rules: Enemy Ordnance that passes within 5cm of a Firedagger class Frigate counts as moving through blast markers - any ordnance that is removed as a result is replaced with a blast marker.
Individually not very powerful, but still handy to have around and a 1/6th chance of wiping out an entire wave is probably a fair bit more useful than 1 transferable turret. (DIE FDTs DIE DIE DIE, I hope Nurgle Gets you!) The nature of the effect means that you're only likely to get a couple in strategic places, and not whole units of them, but that's not necessarily bad thing...
As for why you'd play with a Bakka fleet, you can construct a very fast fleet, with nothing under 25cm, or you have a good variety of battleships, battlecruisers and light cruisers - no restrictions on the Endeavours! The only drawbacks are a lack of AC, I would have liked to include the Enforcer, but I couldn't quite rationalise it - Tartanus is a better place for it.