I mean, have you just tried setting BACK_BATTLER_SPRITE_SCALE to something lower than 1? I have no idea if it works, off the top of my head. Seems like you should at least have tried it first.
Fixed a bug that would cause a crash when viewing the Battler Info UI of a battler who is in the middle of a two-turn attack.
Overhauled the entirety of the effects list in the Battler Info UI. The description text for effects have also been improved to be more detailed or specific if possible...
Fixed a bug that could crash the game at the end of a battler's turn.
The ability Perish Body was previously overlooked when considering boss immunities to OHKO effects. This has now been fixed.
Tweaked and simplified the code related to boss immunities for all relevant moves and effects...
He's using Essentials Deluxe, which is the v20 version of the Deluxe Battle Kit. Essentials Deluxe totally overhauls all of the species file code entirely, something the v21 plugin does not do.
Revamped the code for trainer shadows, simplifying the code dramatically.,
The correct trainer sprite will now load if the player is wearing an outfit and triggers certain DBK animations.
Plugin Updates:
Overhauled all of the code related to drawing animated shadow sprites.
Pokémon shadows on the player's side are now cast in front of the Pokémon, like in Gen 5, rather than behind them.
The Substitute doll now casts its own shadow, instead of using the default Essentials...