Spring Pressures. Solid roller lifter on a hyd roller cam.

Yep, Different strokes for different folks
Pressures are grind dependent and imo
"Street" means different things to different people. Repeat, You can run much less depending on the grind.

These are not opinions these are facts straight from our Spinton and dyno info from 50+ years of testing. We "Crower" have tested many different cam profiles from our catalog and other manufactures, the end result is you WILL do more damage with less spring pressure than you will ever do with the minimums I listed above.