Can't remove clutch line.
 

I'm trying to remove my clutch line so i can install a Z Speed master cylinder. I cant loosen any of the fittings on the clutch line. Ive tried putting pb blaster on the fittings and it doesnt really help. the 10mm wrenches i used is making the bolt rounded. i tried using a flare wrench and one of the sides on the wrench snapped. Im out of ideas. Any suggestions?

Vice Grips, I use them before I round the nut off.

Maybe a little heat, too, but use reasonable care.