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No expert!
I have been told shining the springs to within .060-.080 of bind at full lift causes the coils to bump into each other and dampens the spring which makes it much more effective.
I can tell you with no shims I could only spin to 6600-6700 depending on boost level. After adding a .050 drop lock I could spin it 300rpm higher. I think I was sill .020+ short of being .060-.080 from bind.
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