Digital BW, The Print

This weekend I was experimenting with various mixes to produce a more
colorfast UT2-Y (sepia).  I found the following mixture to give me the
color sepia I like:

  20% (3:2 of MISPRO-M:MISPRO-Y)
  80% (4:1 of R800-Glop:R800-PK)

The mix is very close in color to UT2-Y only SLIGHTLY less magenta
tint and SLIGHTLY more brown tint which I like.

However, after shaking the mixture for about 30 seconds and watching
the bubbles breakdown before loading a cart, I noticed that the
individual colors seemed to be more obvious on the sides of the bottle
that with UT2-Y after shaking.  (The bottles for the two inks are
different plastics).  It made me wonder if there may be any material
incompatibilities in this mixture.  I don't recall seeing any
mentioned on the forum, but I'd thought I'd ask before loading it in
my printer.  Does anyone know of any incompatibilities in the above
mixture?  Paul, is it correct to assume you've mixed these families
before and not had any unusual problems?

Bob