So, I actually do use CSP for the file, but in its psd format specifically. I send the psd file to Krita to save as a PNG since it has a script that can save each layer as a separate PNG automatically. This was very necessary for me as my model is approaching 100 layers/sprites in size.
I'll give this a check next time I work on tweaking my model!
I did a lot of testing in exporting in different formats (PNG, JPEG, PSD, etc) and ways - I think it's exporting at all through Clip Studio that adds that weird white pixelation, and from there it can get a little confusing on how to fix it since I don't recall if it's fixed by re-exporting in Krita. For some reason, Paint works? At this point, because a lot of my art friends use Clip, I just open the png file in Paint, hit ctrl s, and then close paint to get rid of the border on every piece one by one. If you find an easier way to do it let me know!
