I’ll try and explain the issue with some screens.
In screen below you see formations on the beginning of the battle. The idea was to put a long ranged cruisers behind beam cruisers.
Ships start moving toward enemy and after some time back line cruisers are in the front line, making them primary target for the enemy.
My back cruisers have better engines and normally move faster when they are alone.
Now this problem is not noticed on small maps as they start fighting almost instantly. (and most challenges are made on small map) This problem occurs on medium/big maps where ships have to fly some distance before engaging the enemy.
I know it might be difficult to change ships AI, but I thought I should mention this problem.