What if there was a point system based on ship tier and a limit to the points spent by a Fleet entering the ques ?
Example: If a tier 1 ship cost 1 point and a tier 5 ship cost 5 point... and group of 5 people could only bring in 10 points of ships.. then any given group would be forced to use lower lvl ships which would create a reason to hang onto those ships we lvl'ed up in and could even open the door to multi lvl pvp.
Just a thought