Digital BW, The Print

Would it make sense to add MIS 2400 carts 1 by 1 as the Epson OEM
carts expire ? 

Or should I take all the Epson OEM carts out (and waste a lot of good
ink) and put in the MIS 2400 carts as a set ? This is for the full
color set and not the B&W only. I get the impression that putting in
the carts one by one would work well enough. I am now using the PK
glossy with Kirkland glossy paper.