While i think the Pensecola needs some work, the biggest change to make it abit more friendly is changing the skilltree a little bit. The guns should not be tied to the b hull. Make them directly researchable because they are the absolute bare minimum to make this ship workable in any way or form . The grind from the stock pensacola is tedious, to put it nicely. So either you play with a almost useless stock pensecola or you use your free xp to directly train it. However you have the Colorado aswell at Tier 7 where you need to use the free xp to skip the extremly bad stock hull.
A fully upgraded Pensecola is not perfect but atleast you can see the idea behind it, however stock it is outclassed by almost everything on the battlefied. While this is no problem at, lets say tier 5, it starts to get progressively more annoying at the highter tiers because the grind takes longer and longer. In an ideal world, the t7-t10 the stock hulls should be comparable aswell as upgraded hulls and not just only fully upgraded ships.