I use an Epson 1400 and generate blacks on transparency film that is absolutely black enough for burning perfect transparencies. I generate most of my images in Illustrator. In Illustrator I set colours to CMYK, for "rich black." It goes like this:
C=70%
M=50%
Y=30%
B=100%
There are other formulae for rich black and you may wish to google for them and experiment.
On the printer, I go into the settings:
Paper: ultra premium matte
Speed: slowest
Photo: RPM
None of this is carved in stone. You may wish to experiment a with various settings.
I used to fret a lot about Black Maxx ink, RIP, all black inks, etc. I'd love to have all that--I really like cool tools and equipment (cf. my welder, Miller Dynasty 200)--but the printer with software and printer settings works like a hot darn for me and I could not really justify anything more.
Ciao,
Hank