Kintaros are almost entirely forgotten, but I came across this variant which has a NARC duration quirk nowadays, so I tried to make a self-sustained LRM boat with NARCs. You can also build 2x ML and 2x LRM15, but overall it's a bad idea to equip NARC on here in the first place regardless of quirks. x)
Some variation ideas might include using LRM5 + LRM10 + LRM15. That gets you higher sustained dps while being a ton lighter. I haven't tested if the LRM5 counteracts the LRM15 spread. Extra mass could be used to upgrade the slas. Also the RT missile point is higher than the CT. I would place the NARC there or in the LA. I do acknowledge that aiming a NARC can be easier on a centerline mount sometimes.