Some experimentation and a depressing number of hours of my life wasted later, I've found out a few things that seem to work:
-As previously stated, it's best to just browse the top pictures, find something you like, and copy the prompt, rather than slowly iterate a prompt from scratch.
-Set KSampler steps to 20. It defaults to 15 and while the bar looks like it's at 100%, it can go higher.
-Everything but hyperfusion v9 (I think I've gotten my best results from epoch 13) produce some uncanny valley bullshit or is at least sloppier than most sloppa. Similarly, every scheduler besides Euler A(ncestral?) kinda sucked.
-For controlnet, I found it worked well enough at 0.3 strength. At 0.5+ it often had too much influence over the final slop, doing things like overriding a tag like "hands on hips" by sticking in a third hand rubbing/grabbing the belly if the original image had something like that. Probably something easily fixed by choosing a better image to steal from.
-Resolutions that don't include 1024 in one or both dimensions sometimes mess up the color/lineart sharpness.
-The tag "hyper_thighs" at :2+ made EVERYTHING have stupid fucking :3 hamster faces, which I assume came from some furry-based data.
-In general, any tag set to a value beyond :3 causes weird shit to start happening, although depending on your tolerance :4 is a good limit. At :5+, The Warp sets in, and turns you're waifu into abstract art.
-From what I can tell, "hands_behind_back" works much better than "hands_behind_head" for hiding those strange fleshy tentacles at the ends of a character's arms.
-"cityscape" seems to be tailored for giantess stuff, kind of surprising, but if you want regular urban chicks, just "city" should do.
To the owner, or anyone else in the know: is there a way to add comments to prompts without interrupting the tags? Neither //text nor <text> seemed to have an effect, but it would be nice for more readable formatting.