This little mod will lock the ear position in all the headgear that is allowing it, no matter what player replacement or mod are you using (Linkle, Zelda, default Link...).
Install it in case you are getting an endless bouncing ear movement in some headgear after installing mods like the Girly Animation Pack:


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SETUP
Install the mod using the latest BCML version and make sure it's at the absolute top (the highest priority in the mod load order). During the install, you will be asked to apply the lock in all the listed headgear, or just in the ones you want to fix (the headgear not listed there, is safe and cannot be affected by the bouncing ear issue):

WARNINGS
- This mod does not cover new armors added to the game (but usually, all the new armors have this vector already at zero, so probably you will not get the bouncing ear issue on them).
- Also, some headgear is not upgradeable in the game: If you are using mods to allow it, this mod may not work correctly or it will only fix the bouncing ears issue in the not upgraded headgear.
- In general: if you have a mod containing sbactorkpack files not listed in the Technical Stuff section below, and these files have the EarRotate vector with a non zero value, then you might get the bouncing ear issue for the headgear on that specific mod.
THANKS!
A big thanks to bob920717 for discovering the solution, kindly sharing it with me, and also providing the Switch version of the mod! Also thanks to OrionKaelin who noticed the issue and helped trying several solutions, and Liberator_Elite, rez11 and other users who shared the issue in the comments of the Girly Animation Pack mod page and here :)
TECHNICAL STUFF
Installed with BCML, the mod will change only the value for the EarRotate vector to (0, 0, 0) in all the existing Armor_nnn_Head....sbactorpack files in the game with this vector having a different value than zero (67 files out of 186 in total, covering all the headgear present in the game + updates + DLC):

