User blog comment:Hayashi H/Winter 2016 Guide/@comment-45.113.85.51-20160214144140/@comment-26486243-20160219085815

Actually what I'm wondering is whether I should put turbines instead.

The accuracy of the main fleet in a TTF is extremely low, as it simulates an engagement where ships doing a transport operation stay far away from attackers while the escort fleet engages in direct combat.

By and large, the main fleet won't hit much. Triple radars result in something like 40-70% accuracy on lvl 90 DDs. Additional guns will add not much more than 6 firepower which will likely still do scratch damage on the boss even so, as it has more armor than DD shelling is capable of penetrating. Having additional accuracy will increase the chance of scratching.

The turbine idea is to give up entirely on main fleet offense, and use it just to save buckets should enemies aim at the main fleet DDs.