That wrench should be fine for this use. I think you are simply a victim of low quality threaded fasteners. There are a lot of them out there. I wouldn't beat yourself up over this.
I'm sorry I don't have any helpful suggestions other than to contact Sig again. I am sure you are not the only one having this problem.
Joe Mamma
"Reliability above all else"
NRA Certified Pistol and Rifle Instructor, Life Member
Glock Certified Armorer
Beretta & Sig Sauer Certified Pistol Armorer
Colt Certified 1911 & AR-15/M16/M4 Law Enforcement Armorer
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