Digital BW, The Print

This is probably directed at Paul...

My 1280's CFS has given me too many problems lately so I'm trashing it for the spongeless 
carts. I'm using the UT 2 inkset using both QTR and Paul's curves but since I don't print much 
Sepia I was thinking of replacing with a lighter "highlight" gray ink and have QTR take care of 
it. But I'm not sure which ink one I should use? 

I'm guessing below...which one or is there another I'm missing?

From the UT FS 1160 ink set....UTFS-4-Y ULTRATONE FS B&W INK - YELLOW POSITION

From the UT7 2200 ink set....UT7-4-LC Light Cyan Position - LC (light gray)

Many thanks,

John V.