Nice pics!! There are "AFAIK" 2 four spd shifters. One for the early 4 cyl and a different one for the 2.8.
You have the better one like me. I also have a difficult time getting into reverse so I've been slapping the shift handle with open palm to get it to go.
Looks like that cam that contacts the roller is too steep and the adjustment angle is not in your favor. Not much can be done about that.
So I was thinking of modifying the ramp on the cam for a milder engagement. Dremmel tool comes to mind.
Like someone posted above, cutting a coil or 2 off the spring should help.
While your in there you may as well check to make sure your backup lights stay on when you take your hand off the shifter when its in reverse. That's another problem with these shifters.
Spoon
------------------
"Kilgore Trout once wrote a short story which was a dialogue between two pieces of yeast. They were discussing the possible purposes of life as they ate sugar and suffocated in their own excrement. Because of their limited intelligence, they never came close to guessing that they were making champagne." - Kurt Vonnegut