Digital BW, The Print

I'm trying to figure out which PK to use in the R1800.

Paul shared some advice here:
http://www.paulroark.com/BW-Info/3MK-Glossy.pdf

"Initially I used MIS K4-PK is in the Red position, and MIS R2 PK is 
in the Blue position.  I will probably change this, as the MP-PK 
seems to achieve a higher dmax at a lower ink limit than the 4k-PK. 
The R2-PK was optimized for the R200 printer and has 10% blue 
pigments in it.
I'm having a little trouble deciphering which PK is which.  
MP PK = ?  4k-PK= K4-PK?

I'm wondering what Paul and others settled on for a high Dmax on 
gloss-type papers with this printer. 

I have UTR2 PK and MISPRO PK lying around that I used with my R220.  
I'm finding that the PK I got from the MIS R1800 color ink set is 
hiting max density too soon and forcing me to drop back from Photo 
RPM to best photo to avoid density reversals.  Unfortunately doing so 
leaves me with a lower Dmax than I was getting with the R220 and some 
moderate microbanding.