Well it depends but Ise CV has many uses.
And by many i mean MANY.

1 - Gunspace sucks but 14" N holds a good ammount of ammo if you want to actively slug it out and support larger BBs while providing your very own fighter cover.
If you just want to focus on the CV or TW part of Ise use 16" do grevious damage to anyone who accidentaly gets in range.

2 - Ise is probably the only BB in the game that can hold torpedo reloads. However torps kinda suck whe it comes to getting experience with them (unless tha last patch fixed it).
On the other hand several torp walls can disorganise the enemy BB line and help your team win (meaning more exp).
AA wise the best thing i can say about it is that it's the best of the worst since for IJN BB 1-3 suck in AA due to small numbers of T slots and/or ridiculous placement and with it's 4 somewhat badly spaced T slots its compareable with Kongo.

3 - If you want to support other (probably larger BBs) take at least 2 FPs. And better set your fighters to return when low on fuel because you don't get a lot of them.
Taking Sams kinda helps with the low planespace but you have to decide whitch plane suits you better.
TBs are Imo useless since they need to attack en masse to do any worthwhile damage and them being T1 only makes the problem more prominent. Not to mention the bad exp torpedo damage gets.
DBs might be cool tho...

4 - Take engies and repairers. I'd prioritize engineers Ise CV has low DP so repairs should go (relatively) pretty fast anyway and faster repairs will rarely save you because of its low DP... but longer/faster OH just might.

It depends on the situation, but the overall one i would go for would be:

1) 16D; Damage is more important than range for ships that aren't capitals; You will be getting in range when enemy ships are distracted by other targets. The range difference between the two gunsets aren't that much, and the alpha strike is better. That said, the 14" L's are still an awesome gunset, and has its advantages, so overall its what you prefer. I prefer the 16"D's personally. Edit:- But as you can only get 1 bind from the 16's, go with the 14's.

2) Torps sometimes work, but because of the huge threat that is subs, PHH are ideal. If you have dedicated ASW, then torps can be the way to go.

3) Fighters beat bombers and scouts. Play defensive with them and kill those, don't waste your fighters in fighter vs fighter battles. T3's work well due to using less space and being profficient at killing scouts and bombers (apart from T5 scouts, but t5 scouts when used right avoid T4 fighters anyway). You could run T5 fighters on there and just permasight for your team.
DB'ers could work if you work with a fighter whore cv, but if you run out of planes you are near useless. They will work easily in GB's, but i'm talking more of a longer, higher skill based battle.

4) I probably would go for two engies (to get the speed cap and around 90 seconds of OH time) and the rest repairers; You could go for a seaman, but if you are just fighting scouts/bombers, you shouldn't need the extra ability on your pilots, and getting more repair/SD/OH time would benefit your role more (which is the opposite of normal CV's). It depends on the pilots you are running and your spare slots, its been a while since i've used one so I can't remember the exact slot loadout for supports.

Since Ise CV is classed as a BB for a while now i doubt Sonarmen work on it.

1. Up to you really,but i prefer 14L's,mainly because 4 binds>1 bind.

2. Ahhh,i remember the day's of torping CV Select rooms with Ises...but PHH will be more useful in your typical GB environment,that or AA Gun's,then again,Torpwhore Ise with Torp Bomber's could be a interesting setup...

3. If your ruling out DB's,then you have the option of Fighterwhoring it,killing scout's and bomber's,like lukas said though,don't waste your fighter's attacking other fighter's,you carry too few and IJN fighter's aren't so great,don't needlessly throw them away,or you could Torp Bomber Whore your Ise,be sure to equip Torp's on your T Slots  in that case,it'll make Torp Bombing a bit easier since any potential targets bulge will be reduced or hopefully,removed.

4. 2 Engies. 

Thank you for the input and advice!  Its been a big help!  I can hit 42knots with 2 Engies and so I've got 3 FTRs and I do have a TB and a DB now so I probably shouldn't rule out DBs as I did.  I rotate the 4th pilot slot with a repair guy depending on which battle type.  

I've used both PHH and type 93 torps in the T slots and am still going back and forth on that decision because when you get close enough to have clear torp launch room, you do risk getting blown away early and that has happened.  I also hate being sunk by subs (since I also drive one..lol)  and I think I'm pretty good as an ASW operator in general.  I can't wait til my gunners get to lvl 79 so I can take a test drive on those 16"s just to see :) 

As an Ise your strongest point is diversity - your ships can adapt to every situation. And so you should.

If your team needs more firepower somewhere, switch in.

If your CVs need more help fighting in the sky, give them a hand.

If there's an enemy sub in, your HH can be crucial.

Always keep your eyes open and assess the situation.