Sensitivity settings need fixing/changing.
Melee sensitivity has the y axis as low and the X axis as high which isn’t too bad but gun sensitivity is horrible, gun sensitivity has the y axis as high and the X axis as low which makes it really uncontrollable to aim consistently.
I suggest splitting all current sensitivity settings in two separating the X and y axis so you can adjust to your preferred sensitivity setting.
For example, I always have my X and y axis as equal sensitivities.