Digital BW, The Print

So far I've been using the MIS EZ inks with success I originally bought 
the pre-loaded cartridges, and when the ink starts to get low, I reset 
the chip and add the approriate ink. Hence up till now I've never filled 
completely empty cartridges.  Today, however, I received some MIS color 
ink and empty cartridges to use in my color printer. Unlike the cyan and 
magenta cartridges, the yellow one is taking a long time to transfer ink 
to the sponge. With the other, I could clearly see ink pour along the 
bottom of the sponge side, but with the yellow, only a small bit of the 
sponge side changed color when I filled the cartridge. I realize that it 
may take awhile for  the sponge to be saturated, and I plan on letting 
the cartridges sit for a few hours. Then I'll use a bottom fill adapter 
to draw off any air bubbles at the valve. My question is should I be 
concerned that the yellow cartridges behavior was so different than the 
others?

Peter De Smidt