How to configure my rear suspension
The squeaking is caused metal parts rubbing against one another, not by the spring 'jumping'. Maybe you mean the spring is rotating on the shock body as it is compressed and uncompressed?

Adjusting the suspension is not the answer to getting rid of the noise, if you did the noise would probably still be there.

BTW, the adjustment you are talking about is the preload of the suspension spring. Here is a question about that (for forks, but the principle is the same).