Glad you got it sorted. What was the prob? Anyway, one would normally expect a small amount of falloff from a condensor type enlarger. Is this the type of B+W enlarger you have? To be honest, it sounds OK to me. My Durst AC707 has a condenser head and at full aperture (using a Shneider Componon S - one of the best lenses there is) typically reads around 0.3~0.4 difference between the centre and corners, as measured with an RH designs Zonemaster 2. This improves as one stops the aperture down, which is what I'd expect in your case. Even when I used a colour enlarger (with a diffuse light source) there was a slight amount of falloff. Next time you make a print, just burn the edges in a little. I've rarely made a (big) print that didn't require some printing in at the edges. Hope this helps, Taxor.
-------------------- "I wanna hold your gland". Lemming & McCartney