If you think about how much torque you can apply by holding the front wheel, a tool with a 6 inch handle won't come close. Soat it in PB Blaster, Liquid Wrench, Kroil, etc. for a few days and try again. Another trick would be to heat the lock nut with a hair drier to try to get it to break the rust and corrosion that is holding all this together. And assuming you do get it apart and rebuild it, grease, grease, grease. BTW, the "lumpy" feel you are getting is probably because the headset lower race is fretted. You will see a series of evenly spaced marks on the crown race. The fixes for this is to replace the crown race or to go with loose balls (no bearing retainer) so the balls don't align to the same spot every time.