The good news was the SA trigger pull was short, consistent, and had a very quick reset. Double-taps were easy, and accuracy was pretty good, with only 50 rounds fired so far, and that was cheap, old ammo.
That's 20 rounds, and I was concentrating on the gun, and not my shooting skills.
I think I'm going to tempt fate, and take it apart farther than the manual warns. First, I want to see where the "tells" are in contact points. Second, I want to study the kinematics of the start of the DA pull, and see if there's full contact on both surfaces, and whether a tiny radius on the strut might start the cocking process a bit slower and more gently. Maybe my dad's P38 will offer some clues, because for rushed wartime production, it still does a better job than this.
Oh, and one tiny nip from the slide. I guess my fat American hands don't quite match 1930s German ergonomics exactly, which means being vey careful trying to achieve a high thumb hold. Still, vey pleasant, and accurate, to shoot once past that long DA pull.