Hi shiny
Yes you are right we should place spring in unavoidable cases only.
We can always ask caesar default to select spring but problem is that it can not solve all our problem related to sensitive nozzle load. Some time proper manual selection can produce much better effective result.
You are absolutely right to say we should not use/select spring that produce adverse effect.

Test file I made was to indicate that spring can produce adverse effect in one more case called WNC other than producing adverse effect in operating or sustain case.
I think that clarify the point.

Regards

Habib