Remember, when you cut a spring shorter,
you will increase it's PSI rate, and if you add
more coils it will soften it's spring rate, my guess
would be that Calmini used the same rate as
the stock spring, but had it wound longer with
more coils and now the spring is under more
stress that it softens more than it should and
begins to sag, that or they had cheep springs
made and they are loosing their temper and
softening up after being used for a while
My 2 Cents
Wild