I just looked at my load data, and the OAL I'm good with on my .357SIG loads is 1.135" (not the other value which I stated earlier.)
Looking at my load manuals, the max length for .357SIG is 1.140" The slightly longer ones may be the ones giving you problems.
I didn't want to mention any SIG pistols on this post, because you were having problems specifically with the G32 Gen4, but now that you've mentioned the SIG pistols, I'll go on to say that I shot the same loads with a G22 w/G31 barrel, a SIG P229, and the G32. Both Glocks were Gen4 models.
Oh yeah, I've got the crimp die set to 0.379" and don't have problems with setback, either.
Hope this info helps.
Shooter of many Glocks
Ammo by Dillon and Hornady