I would love to turn it off as well. I will rarely, if ever use matte black. I print on the ID Glossy and Satin papers. Right now I am down to 40% on my demo matte black cartridge, even though I have only made one 11x14 print. Strangely on the colors I think I should be down on, in this case red, I am at 47%...!?!? (I print a lot pictures with red). I guess the slow waisting of matte black ink is simply the cost of doing business with this printer.
Jim
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Don't forget that it took at least 14ml to prime the tubes, and PH. Hence your usage is indicating this rather than actual usage.
Also if you want to print with Photoblack rather than MK you simply trick it to printing on a photo paper, where there is no MK going down. Doing so gives you weak blacks, if you use matte or semi-matte such as HArmon Baryta matte. You must use these papers on matte settings for anything reasonable to come out.