This is primarily addressed to the dev team.
It seems that the xp bonuses on the ships that moved from Tier 1 to Tier 2 is pretty out of whack compared to the ‘native’ Tier 2 ships. Case in point with the Empire:
Rank 4 Ships:
Dvergr Knight (was Tier 1): +15% reward bonus.
Hercules Arrow (was Tier 1): +15% reward bonus.
Iron Harpy (was Tier 1): +15% reward bonus.
Deimos (native Tier 2): +45% reward bonus.
Rank 5 Ships:
Dwarf (was rank 4): +65% reward bonus.
Steel Harpy (was Tier 1): +22% reward bonus.
Similar problems can be seen in the Federation and Jericho ships; vessels of supposedly equal rank can have over twice as much reward bonus as their rivals, for seemingly no reason.
I assume this will be fixed in an upcoming patch?