Ya know, thinking about this, Shoyrtt has
175 LB springs all around his Sammy, and
that thing is soft and flexy, why are your
springs so stiff ?? Either you got the wrong
springs, or Shoyrtt has softer than 175 :-/
I wonder if you got progressive rate and
he has what ever you call non progressive
springs

The Dia of a spring makes it
softer also, a small dia spring made of the
same spring wire, will have a higher rate.
Same with the # of coils and the pitch of
the wire in the spring, it all contributes to
the rate of the spring, 16" spring with say
10 wraps will be stiffer than a 16" spring
with 15 wraps, both being made of the same
wire.
Get some specs of these springs, wraps,
length, wire Dia .....
Wild