how about the install? where do you have speakers installed? have you properly dampened your enclosures? do you have enough air space for your mids? Those K2s require a LOT of air space (think a door).
I'm sure that tuning will take care of quite a bit of this, but if the others aren't taken care of, no amount of tuning can make up for it.
I'd be interested to know how things turn out for you.