Personally what you mentioned about sentih stats being upgraded is enough for me, and the fact that the battles will now depend on the ships you have individually and not the total index of all ships, there is no need to change for anything else
Everything is okay so far, the bombers boost your attack but are expensive to move, but sentihs attack is too low, even though it is the best" and most expensive ship, we shold imporve the sentih stats. Lowering the cost of moving bombers will only benefit those who have thousands of them. Improving the sentih is stats is even fair for those who spent so much producing them and invest in research to increase its stats
sorry steven, but bombers are ruining it, any random player with low research could just do bombers day and night and eventually have the same battle power as an elite/expert player.