An update on this.
Halfway through season one, the series changes its tone a little. It seemed to drop its usage of scenes of shock gore in favor of more action scenes, and added a new gimmick: at the end of each episode, they now do a moody little sequence, usually without any character dialogue, under a music track with lyrics which are so on-the-nose to what's gone on in the episode that it frequently strays into the realm of the twee.
I haven't had any trouble with the show's gore levels since the middle of season one (except for one brief surgical shot, near the start of season 2), up until just now.
I just watched an episode shortly into season two, and there's a whole plot point that I apparently missed. In my brain, Character A was in dire peril from Character B, and we cut away to a different scene with other characters. Later we casually see Character B again, who now has a massive stab wound (but is not actually dead). Nothing is explained, although I gather that A must have somehow escaped B and then stabbed him? I guess? A is shown later on to be okay, and nothing is said about how they escaped their earlier peril.
I suspect that there must have been an on-screen fight between the two, and maybe my brain edited the whole sequence out for graphic violence? I don't know.
So now I'm wondering, since I have this obvious spot where my brain has pretty clearly edited something out of my experience of the show; did they actually tone down the gore during the course-change I noticed back in the middle of season one the way that I thought they did? Or did they perhaps actually ramp up the gore to a level that my brain is now actively screening it out the way that it does for Game of Thrones and a few other shows?
Maybe I'll get my flatmate to watch it and tell me. Or if somebody else knows off the top of their head (it's s02e06), that'd work too.
My pet theory re: my brain editing things out of television episodes: The universe is a computer simulation built for entertainment, and whatever extra-dimensional entity is "playing" as me has their "parental controls" mode turned on.