Saulosi , they are very popular ATM small, peacefull and good colouring they might be more your suitable for your tank ?
I`m sure Justin will agree !
I do, they are fantastic fish, however, it's taken me a year to get the saulsoi and the sex ratio i wanted (actually i'm still not completely there yet

)
from my searches ADULT females are comparatively rare, and also expensive in comparision, so i would take your chances with some middle sized ones and see how you go, or the other route would be to buy guaranteed pairs of WC fish, but again, you'll pay through the nose and still end up with 2M and 2F rather than at least a trio ..
On the subject of the tank - thats a new tank right Cheffi - not the same as the one that was there when i dropped off the petricolas right?
what size is your pulpican?? i have loads of spare juve pulpicans and they are between 1" and 2" and most i think (apart from one) is male, that may help, but then again, you say you don't want any extra spawnings..
These are my two mbambas, are they anything like yours Cheffi? mine are hte mpanga bay type
small fish eh? how about a decent group of yellow labs (make a change from the blues) or try and get a hongi colony going instead?