One save coming right up:
https://drive.google.com/open?id=17byC__z9l0hjs5esF7oUtxWWVi5-3P-_
In save wizard, search for 3C8F (equipment drop rate) in advanced mode. That should help in locating the edited soul core (Yatsu-no-kami)
To make this clear, this save is for
v1.07
Obviously people will need to resign to their respective region.
As for the how, it really is as simple as following the already available guide here on the site. The catch is that you CANNOT unequip the soul core you have edited, change guardian spirits, or enter twilight missions without the values resetting.
For this reason, I recommend editing Yatsu-no-kami's stats, it's powerful enough to carry you to endgame without bonus stats, so no reason to unequip it.
Additionally, dying will reset the values, but only temporarily until you retrieve your grave. Have not tested if dying twice resets values permanently.
Some other odd quirks:
When viewing the yokai under the "attune soul core" menu, the values will display as if they are unedited, this is normal.
Make sure to LOCK the desired soul core for editing as when performing resting rites there is a chance that the values will reset on their own (no idea why, but locking seems to have prevented this so far for me).
Dojos may also cause a value reset, both beginner and intermediate take away your guardian spirit and soul cores.
Have fun guys! And let me know if there is any issues, I'm by no stretch of the imagination experienced on this topic, but I'll do what I can.