Hello, I have a "luxury problem"

At Warzone my crouch and slide is steadily on the circle button.
On my XIM, I assigned the circle key twice: once it is CTRL and once it is key F. It is double assigned because I want to crouch with CTRL and slide with F.
And now to my real problem: as soon as I * crouch * and fight with someone and get knocked, my finger stay AFTER I got knocked on CTRL (for whatever reason) and what happens afterwards? I idiot finish myself because you know you finish yourself with the circle button

That’s has cost us victory sooooo often. Does anyone have any idea how I could solve this problem?

Thanks