Not sure if it was mentioned already or not, but lets not forget how Hull size impacts combat.
Jenquai do not need as much space as they do not use Missles or Projectiles. so less hull space does not hurt them as much as the other classes.
Progen use Projectiles which usually stack high and take a while to go through.
Terran use Missles, which do not stack very high, and are often quickly consumed.
With my CL34 TE, i go through an entire hull of ammo, in about 30-40 minutes.
Then i have to fly all the way back to a station, rebuild/reload on ammo, and go back out.
I usually have about 5-6 empty slots when i go into combat, every other slot is Ammo.
I honestly feel the Hull size of any class that carries ammo should be increased, more specifically Terran. ;P