Howdy guys. I am having slide velocity issues with a XD-40 4" with a stormlake 9mm 4.5" conversion barrel. I replaced the guide rod with a Wolff solid rod and 17lb spring. here's the issue. I am running a very reliable HTG 9mm suppressor (on my old xd) the gun wants to catch empty cases. factory reload etc. I then cut 2 coils off the wolff spring....works every time. now the problem is there is a small amount of slack before the slide goes into battery. The big question is who would make a full lenght spring in 15lb or so. any other sugestions are more than welcome. thanks ahead of time.