I had similar symptoms with my 92, no matter what I did with the adjustment on the cable it was still horrendous to get it in gear... even changing gears.
When I finally got someone to push in the clutch for me so I could look at how things were reacting all along the cable, I noticed that my firewall was cracked and flexing. So much of the motion that should have been disengaging the pp was actually just moving the firewall. Fixed the firewall, adjusted the cable and no more grinding into gear.
This may not be your issue, but easy to eliminate as a culprit. my $0.02.
69 Mach 1 (351W-4V, auto, 4.57s) - 1st car, BUY 6/28/1979, SOLD 9/29/2012
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66 Coupe (351W, 4 spd, 3.50s) - SOLD
90 Notch (5 spd, 3.55s, Wild Strawberry/Blk) - SOLD
92 Notch (5 spd, CAI, 3.55s, BBK Equals, cat'd H, Magnaflows, Deep Emerald Green/Gray) - former DD now garage Queen