With a sufficient amount of ships, a fleet can just adopt what I'd call a wrench formation. Probably more of a pincer move. At least 1 ship each in the center and 2 (as it's 3D, better 4) prongs. If the longer ranged ship engages the center, the center falls back and the prongs advance, forcing the opposing ship to either fall back or put itself in jeopardy.
In the latter case, the prongs will collapse onto the target, possibly getting a hit in.
In the former case, nothing much happens, and the process repeats itself.
If the target engages one of the prongs instead, that ship will fall back and to the side, and the formation will rotate.
Finally, given the ship count advantage of a force like the TH, they can probably keep a few ships in reserve, either to rotate fresh crews (even an elite crew will degrade rapidly after several hours at 3G) or to keep a jump reserve in case the battle ever propagates outside the jump limit (or near a La-Grange point).
Of course, with a number superiority, they could also set up multiple layers of accelerating fighters, forcing a faster, smaller enemy fleet to either get off their back for an hour or get hit either by the fighters or the battleships.
At least, that would be my take on the situation. The TH navy is actually rather unsuited for the task as a whole, as only their constitutions can really engage in those tactics, and that requires at least a 4:1 numerical superiority.
Edit: Man, Nihongi will be ancient when he's done. Assuming he's not assassinated soon.
