Can't say I've ever had this much trouble undoing the bottom bolt.
remove the top nut, use a long tube (pvc) to compress the spring?
Wedge a piece of wood against the damper after removing the spring?
Fine sand paper, followed by a stone might clean up any nicks in the fork tube.
Loose nut holding the handlebars
He’s one of those who knows that life is just a leap of faith. Spread your arms and hold your breath, always trust your cape. Guy Clark "The Cape"