Digital BW, The Print

I'm impressed with the ABW mode but I'm not a fan of the brownish (or 
warmer) K3 PK & MK inks. I have used Eboni in other printers and it 
makes a subtle improvement. I'd like to know if the same holds true for 
the MIS gloss black as compared to Epson photo black?  And if so, is 
there a way to get Eboni & gloss blacks for the 3800 80 ml cartridges 
(refill kits or loaded carts i.e.)?  I dont believe MIS offers 
this...?  And while were at it, concerning the LK & LLK inks, would 
there also be any improvement using the MIS blacks over the Epson inks 
in terms of it possibly being more cooler toned blacks...? 

Thanks in advance!
SteveB