Hax jump bounce issue

[VectorM12]

I don't spam the keyboard, I only press it twice. This is how I do it:

I press SPACE+SHIFT 2 times quickly (jump-crouch+jump-crouch) and the bounce ALWAYS occurs, but I try cancelling it by staying in crouch position however, this only works about 3 times out of 10. I never use bind. Bind is for noobs (IMHO). But I just wanted to know if there is a 100% way of cancelling the bounce (maybe I'm pressing the buttons in the wrong order I dunno, I@m only learning).