Actually, BS missiles are rather fast, they are capable of catching GBs, completely unlike cruiser missiles which cant even hit other cruisers (Tried a praefect duel with them once, even in a joust they wouldnt hit the target).
For the 5 empty slots, id say that, seeing as you already have heavy anti cap defenses, dabs suggestion of 3 BRs and 2 missiles would be one of the best options, though you might want to consider this, you dislike secondaries for their short range (i think its usually about 2k max), BS BRs only have a 1500 m range, so you will have to get close to fighters/bombers no matter what if you want to be effective.
Though having said that, there are very few bomber pilots (in my experience anyway) that have the ability to keep outside 1.5k all the time, most get to very close range to ensure they hit you, also, GB weapons max at 1.5k, so you should not have much of a problem with range.
The only question would be on firing arcs, if you can have most of those 5 spare turrets firing at once on most angles, then secondaries would be a good idea, if however, you are at many angles restricted to firing only one or two of them, BRs would give you muct better firepower.
no pulse guns, they are rather worthless in my opinion ( others might like them though )
no mortar, and if you really need - one heavy mortar - although i d not really recommend it.
no secondaries
no solaris
no cerberus turrets
on the persephone ( 13 turrets ) i currently enjoy
- 10 primaries
- 1 HM ( but will swap it for a razor )
- 2 missile turrets
the focus of this ship is to fight nomad battleships. - 10 primaries drain the powercore, but in a controllable way. - 1 heavy weapon is all you need, cause the primaries are doing the heavy duty job now, too - and better.
2 missile turrets ... never underestimate the power of blast damage. - you don t fire them on a ship that is currently shielded ( just like you don t really waste a HM on a shield ) - you fire them when your target is deshielded... AND you also make sure that you subtarget something valuable ( bunch of turrets for example )
the nomad battleship is a vanilla ship - henceforth it has a "perfect hitbox" ( one that fits ) - which also means that its turrets are vulnerable to hits.
2 missile hits destroy a turret ( provided you subtargetted ) and even a nomad battleship cannot always spin out of the way of the missile ( and they got no flak to defend against missiles, nor does it have a CD to shoot it down )
missiles are awesome - and one of the only really nice cruiser defense ( provided the cruiser knows what he s doing )
what you need to make sure it to mount turrets where they are most effective.
for example - mount a RAZOR turret as much in the middle as possible, cause the auto-aim works from the ships CENTER. - so if you mount them at the nose of the ship, you ll miss.
secondaries are indeed very good turrets - just not on the juggernaut - where they barely fire further than the ship itself. - but on a smaller battleship, they are a real alternative.