Boing, that low-and-left thing seems to be an undocumented feature of Glocks; my G20 does the same thing for everyone who shoots it. It groups nicely, though.
I have the same guide rod and spring; ain't that thing a major PITA? Once it sets, it's easier to deal with, but that first install is evil. It makes my full-house 10mm stuff feel like a .380.
"The right of no person to keep and bear arms in defense of his home, person and property,
or in aid of the civil power when thereto legally summoned, shall be called into question.."
Article 11, Section 13, CO state constitution.