Missions & Complexes

I would not recommend to focus in T2 guns right now. They add only 10% to damage (unless you use T2 ammo which is quite expensive for mission running and will eat a good part of the reward) compared to meta level 4 T1 weapons. And you must train the specialization skills to level 5 to get this 10% which takes a lot of time for large guns.

In addition the fitting requirements (PG and CPU) for T2 guns are significantly higher which might have the result that you must fit one weapon less or fit a reactor control or PDU instead of a damage mod. This can be counterproductive and destroy the benefit of using T2 guns in the end.

I would focus more on training the gunnery support skills (Surgical Strike, Motion Prediction, Sharp Shooter, etc.) to level 5 (they have a bonus for ALL weapons), the Rig skills to higher levels to reduce the rig penalties and the battlehip skills to level 5 to benefit best from their built-in boni.

Losing 4 battleships is hard, hopefully they were insured. Maybe you should exercise a time on level 3 missions (with a cruiser!, to make if more difficult and simulate a hard level 4 mission). I would prefer this over rejecting every second level 4 mission.

Go away! You didn't even read the whole string. BTW, work on your spelling!