I keep a little book to make notes in when I change the suspension. After the changes are made and an entry in my note book I go for a ride around familar roads and come back and make notes on how it effected the bike ride.
Try this so when you do make a good setting and you change it & it is not as good you can go back to the last setting and know it is good.
It sound a bit grade schoolish but it sure as hell works.
Just remember to make your notes after the change before going for a ride, it is easy to forget during the ride what changes you have made.
If you end up at a track day or the like, make notes on track temp, ambient temp, weather conditions, amount of fuel, bike settings and it will soon all make sense on how changes will effect your bike and this makes changes in the future easier to predict.
I hope this helps
Corbywan