The number of ships you're having me destroy is downright ridiculously excessive. I count at least 20 wings in Avenging Adhara. Why do we have to destroy soooo many?
Well, it is an intergalactic war. A head to head battle with the Shivans and most of the encounter is chaos. Like I said in the OP, you will not be dealing with wings but squadrons. The GTVA is dealing with an entire race and it is actually outnumbered significantly. It will not be plausible if there are fewer ships and I intend to let player feel the gravity of the situation. What you felt is actually what I intended. I based this on actual experience. Just take it as an opportunity to rack up your kill count and adding destroyers and Juggernauts to your tally.

In fact in key epic missions, I reached the 400 limit in FRED. I want to have more.
There are hostiles that are not designated (named) because these are not your priorities. Your ship Nav Com take this into account. It is explained in the in-game dialogue in "Escaping Pirates." But in "Torpedo Chasers," that is an actual limitation. The Maras are involve in a cutscene. I want them to jump in one at a time for effect but I can not have them do that if they are part of a wing. My solution is to hide their names.
And JSR, your kill count of 20 wings (60 fighters) is impressive. Did ALL of Aquitaine's corvettes survived? If so then you did get the medal. My kill count is only 10 in that mission but I got the best debrief. I was focusing in knocking out the shivan beam cannons which is my actual objective in order for them to survive. Remember, your CO does not always give you the exact scenario in the briefing room. There is always bad intel which is true in real life.
In some missions, there are levels or degree of success. In most cases, if you get the best debrief, you get a medal. Always check the recommendations. If you get all the medals upon completion of the campaign (this is visible if you start a new profile), then you got it right.
The missions are designed to give players more freedom in-mission hence the levels success.