[Alneyan]

Note that seekers do not allow you to gain experience. It is supposed to have been patched in the latest patch, but it doesn't look like it is working (at least for me). Ramming and boarding enemy ships do not increase experience either.

You have a 25% chance of gaining +0,1% fleet experience per kill of any ship in the fleet. So you will need ten such occurrances before gaining a full point of fleet experience. So you will need at best 10 kills to get one more point of fleet experience (highly unlikely), and 40 kills to have a 70% odd of getting one more point of fleet experience. In other words, reaching high levels of fleet experience is very, very difficult.

Lastly, both ship and fleet experiences are supposed to be capped at 50%. Since I have yet to come anywhere close 50% fleet experience, I cannot check it though.