I only started watching the USA reruns in Oct 1992, but watched pretty well to the end in 1995. I made notes of what was run during that time, and used Jason Hernandez's old episode guide for notes on the rest.
One thing USA did was air six months worth of episodes from Jan-June, then repeat the same six months in the exact order from July-Dec. Then the next Jan, the whole process restarted with a new group of episodes. Another thing USA did was jump around - a lot! They'd usually air about 6-8 weeks from one part of the run, then jump to a different part (usually in the same year) over and over. Why they couldn't just run them in chronological order (especially since the show had returning champions) is beyond me.
Here are the shows that were NEVER aired on USA (as far as we know):
--the first two weeks from 1983; the home player spins (including Larson) from spring 1984; Christmas and New Year's week 1985; late-Feb-late March 1986; September 1986, and maybe a few other scattered episodes.
Here's what they ran:
Sept '87-Dec '88 - the 1985 syndication package from Republic pictures
1989 - I've been told they were 1986 episodes, but I too would like to know which ones. I'm assuming Jan-June, but did they air them all consecutively, or jump around to other parts of that year, or another year. Did they air the "missing months" during this time? Based on what they aired in the '90s, I'd be surprised if it was all six months in a row. They must have jumped around a bit.
1990 - I've been told they were 1984 episodes, I'm assuming from the last half of the year but again, were they all six months consecutively? According to Jason's guide, 6/18/84 was the first episode in this six-month package
1991 - I've been told 1985 - but again, which parts? I have a recording of a USA broadcast of the 7/12/85 episode from 11/19/91 (you can tell the date of the USA broadcast because of promos contained within the show)
1992 - early 1984 episodes, then Oct-Dec 1983; when I started watching in Oct 1992, they aired 1983 all the way to Christmas time
1993 - they started out with early 1984 episodes, but after a month switched to June-July 1986; then jumped back to Jan-mid Feb 1986, then mid-fall 1985; the 1/6/86 episode was aired on USA on 3/30/93
1994 - they started this package with late-March-May 1986; then cycled back to Aug-Sept 1985; then back to spring 1985
1995 - mostly 1986 episodes; last ep aired in Oct was the 5/23/86 show
Hopefully this helps. If anyone has any other details, feel free...