Hello and thanks for the question,
Your 1982 GL1100 has air assist type of suspension. It has springs in the front as well as the air pressure. This is a heavy bike and the front forks are marginal at best. I have had great results from installing progressive suspension springs and moving up to a heavier fork oil (20wt ) to keep the bike from diving so far during braking.
You should look at having the forks rebuilt with these parts and you will find that the bike handles much better than before.
The springs that are in the bike are old now and should be updated with new style parts.
Thanks and I hope that this helps.