Maybe you don't need it to be better, just think of increasing ship cap fore the mk1 leech starship ( and i just noticed what you said about the health)
As the developers said before and gaming history, it's kinda of a different model of leech starship, it doesn't have to be all much better, all stats maybe more balanced overall (guns in fps , spells in rpg)
But it does cost so much more (60 k more per mk level, wow) but you indeed get the bonus of it's feature, more ammo.
adding half of the current ammo per shot makes it , well, 1.5 as effective unless you really need firepower of a leech
. so adding 60k for 20 more shots is reasonable.
Then it's the ship cap, you only get so many ships and if you have the knowledge, well, that's better than nothing,.
Just be thankful it's not like mk2 bombers get reduced speeds.