Take it from a gameplay perspective, people need to jump for something like the jump course in base(Does anyone use it? New to the map), and jumping over basic obstacles.
But jump crouch spam gets on nerves as it ungodly annoying to fight against and abuses the fact that bullets only register the body part they hit (aka, if a bullet hits a leg first and should go through the chest, it will only do leg damage).
So making stamina regen can go many ways.
You can have slow stamina like now but make sprinting basically take up no stamina and have jump stamina intake increase, like 25% or more. This in itself will make jump crouch spam (sorta) gone and obstacles non concerning to jump over. But well, goodbye to your stamina if you get stuck and spam jump to get out and continuing to jump over many obstacles will prove not to be well.
Other way is to just increase jump intake to 15% and sprint have the same stamina intake for sprinting but make stamina much faster to regen like 2 or 4 times faster. This will not phase out jump crouch spam entirely and sprinting will be the same but it's in theory, very simple to implement and the regen as of now is too slow.
Fuck the hitreg and fuck jump crouch spammers, go back to fortnite if you want to jump and shoot.