Well for starters, the "Mirage with bomb" and yellow wings etc is actually an IAI Dagger
I think the Infantry would disagree with you on giving the jets more bombs, most of what I hear about is how much rape the jets are (although IMO, heavily exaggerated)
But anyways the loadouts are based on realistic loadouts for these aircraft during the war.
Ignore the Pucara in that list, it was never fielded with a Torpedo it was only considered
The main reason to why these aircraft where so lightly armed was mainly due to how far they had to fly to the Falklands and the more they carried, the less range they had. It is possible for the A-4 to carry a shed load of bombs as seen here:
But it just simply didn't during the Falklands war for the above reason.
The most common was it to carry a single 1000lb bomb like in this picture here:
But I felt that 3 500lb (adding up to 1500lbs of bombs) would be better overall and was also a somewhat common loadout:
The IAI Dagger on the other hand did sometimes carry 2x 1000lb bombs, but more common for it to carry 2x 500lb bombs and since I've also given it AA missiles ingame which it didn't really carry very often during the war (although is very capable of doing it) I felt it would be best as otherwise it would be the most effective jet ingame, having 2000lbs worth of bombs as well as AA missiles and a dual 30mm cannon, its already the most effective, all rounder ingame with just 1000lbs worth of bombs
So ye, don't see this happening any time soon tbh.