Just remember, cutting or grinding a spring's end causes a lot of heat... enough heat that if not properly cooled it can change the spring rate and the tensile strength of the steel.
Also, the lowered spring has a higher spring rate so that it will respond without bottoming out. The spring rate in the stock spring will bottom out harshly becuase it was designed to have an expected amount of give which has been taken away by cutting.
I'm no engineer, but I've worked on vehicles long enough (and have cut coil springs in the past) to know that cutting springs can have unexpected results beyond lowering.
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