Single Status Update
There is little or no correlations between xp gain and impact factor
from what I understand its the % done to enemy ships HP per ship, how many ships, total cap and defense points, and distance traveled. can't confirm if spotting damage or damage tanked/avoided adds to the total base exp
from my personal experience I get a lot more exp nearly/killing destroyers/cruisers in my Zao than farming fire damage on BBs. Idk... kinda wish WG would just release what goes into exp earnings. Sorry.. I couldn't be more useful T.T
Cruisers and Battleships generally have lower impact than DDs and CVs together. DDs have the mobility, stealth and size advantage enabling them to spot without being seen, and CVs have airpower which really dominates the battlefield. They truly have their impact in the entire game. The main point of this issue is SPOTTING. It is clearly a number 1 factor to winning games. The only way to give impact to the team as a BB main is to get in good position and bully destroyers when they are spotted. Patience is also a key.
Farming BBs for damage like an idiot for the entire game, no matter which class you are in, clearly gives little or no impact to your teammates. That is called being a useless prick, unless if you are being matched with a battle entirely full of BBs.