SHR, I don't agree with your second para. Spring movement is typically a function of thermal expansion. Pressure elongation is exactly the same in effect and is frequently expressed as an equivalent thermal. In fact that was essential in the old days of ADLPIPE etc., software that did not include pressure end effects.

Similarly, the shape a complex 3D pipe system may adopt when supported on springs could be affected by elbow deformation due to pressure (Bourdon effect). Consequently spring position would be affected.