Digital BW, The Print

I have had to use the epson matte black ink in place of the mis 
because it hopelessly clogs. I was cleaning (used 25% of carts!!)
then suddenlyas the black cart was about all the way good it 
completely stopped printing. I can take the cart out and roll it 
back and forth and hear it has ink in it. As soon as I put the epson 
matte black in it works perfectly on the first try. Unless mis gets 
this ink to flow through epsons heads better I will need to decide 
if I want to stay with mis and throw away nearly a third of all the 
ink I buy from them or give up the black and white altogether.