I'd like to ask you if aiming in general could be improved;

• Add key to bring down the weapon and disable shooting ( or switch between ready and relax stances )
• Add animation while sprinting with weapon ( could automatically switch to bring down the weapon while sprinting )
• Add animation for aiming while laying
• Make different poses between hip aim and sights aim

Idea:
Player Animator Lib (https://www.curseforge.com/minecraft/mc-mods/playeranimator) and
BendyLib (https://www.curseforge.com/minecraft/mc-mods/bendy-lib)
could be used as dependency to provide animation libraries which is also used by Emotecraft and Better Combat that provide pretty smooth player animations.