Digital BW, The Print

Hello everybody.
I'm new to the list and not mother language, hence apologies in advance for
my possibly clumsy English.
I recently shifted to a completely digital workflow (I'm an editorial
photographer) and just finished searching into the forum's archive: lots of
interesting topics here, though mostly "Epson oriented".
I'm having a very hard time in order to obtain good B&W pictures from my 42"
HP 5000 PS UV, which I'm VERY satisfied with as for LF colour prints.
Any chance to get what I need, in your opinion, or must I purchase a
dedicated Epson 7600 with a quadtone black inks kit (which I would not be
really happy to), instead?
I'm not looking for a "click here" solution which I know doesn't exist, but
I would be happy not to buy new hardware: profiling the plotter had not
given consistent and repeatable results so far (maybe I'm missing
something), and the built-in RIP really sucks B&W wise: any third-part
solution or specific workflow you could suggest?
Thank you very much for your help: this forum is really interesting and will
rise my learning curve quite a lot.

-- 
Toti Calò (possibly in English)
http://www.thgpictures.com
http://www.grafichehorizon.it
mailto: tical@grafichehorizon.it