I think you should first of find someone with the knowledge about when what fighter entered service.
Also the Borderworld fighters like the Banshee are outperforming their counterpart, in this case the Hellcat, by far. At least in my opinion.
Maybe getting your story more worked out and detailed with a little research of what would be there at the given time.
For example if you want to send in a Lexington class carrier it should have a bigger supporting fleet and it shouldn't be to far from any core systems...except you give special reasons to why confed would send one of their most powerfull carriers to an unimportend system.
In general I like the idea of forceing the player to fly ships that aren't that common in confed military.
PS: I would cut out the Excalibure. It was only used very little at the end of the Kilrathi War...as far as I can remember...and before that there where only little testflights. Even when the first set of Excalibures arived at the Victory they where still brandnew.