An update after thinking about it a little more and racking the slide a couple dozen times:
The slide might be a little stiff and that's not really a problem. However, Ruger could have made it easier by shaping the safety lever(s) better.
In the down "off" position, the farthest rear corner of both safety levers still protrude just enough above the frame that you hit/scrape your thumb or whatever on them, more often than not, when you rack the slide. It's because the levers rotate/pivot downward instead of just dropping downward.
After having realized I adapted around it (thanks to this thread) I also know that I want to machine off a tiny back corner of those safety levers, which shouldn't cause any trouble at all. Now that I think about it, the problem is that when they're in the down position (which they have to be to rack the slide), those rear corners stick up up there - the levers can't be pushed any farther down, and more often than not you wind up catching something fleshy on those corners as you rack the slide.
And of course, they're on both sides of the slide, little devils :lol:
That's unnecessary. The slide stiffness never really bothered me, and the serrations aren't that horrible once you learn a little and stop being scared of them. If you think about it, what bugs someone are the 2mm of the safety lever corners that poke/scrape you when you rack the slide.
I'm going to take the gun apart later this week and dremel the back corners off. Box their ears a little, so to speak. Otherwise superb grip ergonomics and I'm just realizing it was spoiled a little by the shape of the safety.
BTW you can see how the finish has worn on the take down pin/plate of my SR9, and how my hands have shined up the grip in the area of the beaver tail. I shoot ambi. and the plate wear is from my left index finger. On the other side of the frame, the finish on the pin has worn basically the same way. This gun is well past broken in and it's running great. And yes, if you look really closely in this photo you can still see the mold marks for the areas on the frame that *would* have been removed if this gun was manufactured maybe a few days later with the longer take down plate.
Thanks to everyone in the thread. It made me think twice about what I *didn't* like about the manual safety. There it is, right there.