The springs probably don't need to settle. Quality springs (like my Eibach's) settle very little. The TUV testing documentation for my springs showed that over 500,000 cycles they only settled 0.5mm.
I've read that what's actually "settling" are the positions of your bushings since the ride height is now different, and thus so is the loading on them. I've read that the bushings should actually be reset (loosened and then tightened under load) so that they have the correct pre-load and don't get overloaded.
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