DemoHi. I just posted a question concerning the fit of these K7xx's. They're way too large for my head as well. Did you ever find a way to get them to fit better?
DemoZipties.
Stack them up along the main bands between the two horizontal guides on each side, that will hold the drivers and earpads higher up along the band. once you get your ideal size it won't warp or stretch out of size again like the elastic tensioners.