Originally Posted by Blazer4show
There is bonus xp for attack done on ships higher than you (certain level ranges do not remember them off the top of my head). Moving from BB4 to BB5 means less ships above you that will give you extra xp.
Also keep in mind that 100K attack on low level ships is not equivalent to 100K attack on say BB5s and BB6s.
what he said.
I remember getting 60k on my iowa 2 years ago (60k was a lot back then) because I soloed a kaiser. 70k attack, since I died bringing him down with me, but still.
Nowadays, getting 80-90k on normal xp (with premium tough) with about anything is easy if you attack BB5-6.