Went through pmxeditor fixing everything I could find. Just glad I found the problem. She's super cute now with Bo Peep and other motion data. Here's a new link for her if anyone was interested. http://tstorage.info/tq1o9n29n0ab
So I decided to look at this. Like you stated it function fine. I'm not too sure what you mean by rotation too much cause I don't seem to notice it too much unless I bend it in a unrealistic manner. However I will admit one thing which is the way the bone is structured in the neck area that very odd way of laying that out.
Like if you load motion data for like bo peep or other motion data her head will turn all the way around at certain parts of it. Yeah about the bone structure I wasn't 100% sure which one I was supposed to link it to so it might not even be linked to the correct neck bone. I know motion data needs adjusted for smaller models and stuff but isn't there a predefined limit in the range of bone angle motion that stops them from turning beyond a certain point? I'll just post an image to show what I mean. Screenshot during Bo Peep motion data with another model next to her to show where their head is compared to hers.
>isn't there a predefined limit in the range of bone angle motion that stops them from turning beyond a certain point?
for bones, no. this is a motion edit fix
Okay, thank you. I'll try to make do with editing the motion data to stop it. The thing that confused me was just that I actually used the model next to her in that picture above as the base for her. So I thought that I had certainly done something wrong when it looked that different. I'll do some more research on headswapping to try to get a better understanding of what I'm doing in the future.
As an update here's a video that will most clearly demonstrate what I'm talking about. I put the edit next to the original ruri model and the original kanda yokumi model I used as a base to show that their heads don't even tilt at the same angles that the edit's is. The motion data is completely unedited on all models. https://ecchi.iwara.tv/videos/z5m5yfdmofk4g895