Digital BW, The Print

>I use an Epson 2200 and have yet to achieve true black. ...

> am I wasting my time by not changing out all my color inks 
> for blacks? ...

Yes.

With QTR you can do good B&W, but the LK as the lightest gray ink will show
dots on close inspection.  UT7 was the B&W "variable tone" inkset I
originally mixed for the 2200.  See
http://paulroark.com/BW-Info/UT-2200-Readme.htm  The UT-3D inkset is the
latest (last) blended B&W inkset I've designed that works on the 2200.  See
http://paulroark.com/BW-Info/UT-3D_Readme.pdf  Now I'm using a non-blended
approach that I've outlined at http://paulroark.com/BW-Info/4K+.pdf 

The 2200 is a capable and flexible platform. 

Good luck.

Paul
www.PaulRoark.com