Bad in what way? Noise, ride, handling, traction? Are you using monoleafs, ss springs or stock springs? What shocks?

I have tried everywhere from 1/4" gap to 1 full turn preload with monoleaf springs. Now I just set the left at 0 and the right at 2 flats preload and call it done. I am going to guess that if you are more than 2 flats tighter or looser than this that you are lost and should be working on the shocks instead.

In my post above from TEN years ago I suggested heater hose to soften the noise. That worked but the hose wore out fairly quick. I now have a piece of 1/4"thick flat polyurethane glued to the top of the springs with 3M weatherstrip adhesive. It is holding up much better.