Spring for the Xbox 360 Real Arcade Pro EX?

I finally got my hands on a Arcade stick and the joystick is too loose for me. Having serious issues executing fireball attacks and other moves. Never had this problem in the arcade. I want to change the spring to add more tension to the joystick. So I went to Lizardlick and they have several springs for sale. I need a spring that will tighten up the joystick. Anyone can recommended which one will do the job?

JLF-SP. Just put it in there with the original spring.

Buy two or three. Put a second one in, it if it’s good, keep the third as a back up. If not, throw the third in as well.