...line lock and restrictor valve for clutch management.
Assuming you have comparable leverage with your pedal setup, have you inspected/measured the size of the orifice in the line-lock? Several folks (myself included) found that the orifice in our line-locks were so restrictive that the Parker valve was the path of least resistance. The Biondo line-lock solenoid was the common denominator for at least 4 of us with this problem...FWIW.
I've heard the same issue. They can be bored out, but I need to bleed the clutch again, and I think I'll try to skip the management to see if the pedal is better without.
They *can* be bored out, but if you don't profile the orifice properly after doing so (or just get lucky), the solenoid may not release under pressure.