Some people complains that healing is a bit too powerful, and several healers gathering together are very difficult to kill. However simply reduce healing speed may make tactical cruisers too weak. I have teo idea which may help solve this problem.
The first solution is that damage taken form different sources takes different time to heal. For example damage done by destroyer and dread main guns are considered surface damage, their damage amount is increased but can be healed in a greater speed. On the other hand the damage done by artillery cruiser main guns and ram are considered structural damage and very difficult to be healed.
Or there is another solution, every time a ship take damage, some of the damage, perhaps 80%, are considered surface damage and can be healed, while other 20% are considered structural damage and can’t he healed.