I would make sure that the selected spring is capable of handling the load and travel for both cases - with and without settlement. I would use the pre-settlement results to set the spring installation load (assuming the settlement occurs after the system is in operation). Likewise, I would assure that the expansion stress range is OK between the installed position (L3) and the two operating cases - with & without settlement.
Some may leave the settlement out of the expansion stress range calculation but confirm that the stress due to settlement alone is less than 3Sh (or thereabouts).