Well you won't be able to use 4 damage boosts because you can only have 1 of each particular tuning item in a ship at one time. So BBs can have 3 different parts, not multiples of the same ones.
Also, there is no component that increases ship DP as in health. There is one that increases ship defense power (called structural strength), but that is a measure of how much damage the ship can take before you lose OH ability and speed. The same function as bulkhead armor.
Once you slot an item, they last for 72 hours, or 3 days.
I'd probably go with a combination of Ammo Damage, Reload Speed, Gun accuracy and Turning.