Hi Stevie
Have you been rolling the stuff on or something?

I know my DelPrado is much smaller at 1/100 scale, but I only bought a single pot and there's still a quarter of the paint left after doing 90% of the hull!
Joking aside, I've always thought the Admiralty Dull Black was a little too shiny for my liking, the Yellow Ochre is also 'Dull' and its a dead matt whereas the Black is more of an eggshell or satin. I find the Citadel Chaos Black is a superb black paint (available from Games Workshop outlets and is a slightly 'matter' finish (longer lasting pot lids too!). Its also better at painting small detail pieces as it doesn't dry up on the brush so quick.
If you want to get the same sheen you could always use a matt or semi-matt varnish, either brushed or sprayed over the entire hull sides which will make all the black paints used the same sheen.
Best of luck with it anyway.
Robin
First wooden ship:
The Grimsby 12 Gun 'Frigate' by Constructo Second:
Bounty DelPrado Part Works Third:
HMS Victory DelPrado Part Works 1/100 scale
Diorama of the Battle of the Brandywine from the American Revolutionary War Diorama of the Battle of New Falkland (unfinished sci-fi), Great War Centenary Diorama of the Messines Ridge Assault
Index for the Victory diary is on page 1