The springs do make a difference. They don't have give so to speak but they back off. You can use ttech tubes. You just have to take the ball off the ttech plunger and the bullet off the flite bar and put the ball on. I use wrath tubes with them and it works great. If it makes some noise then take a small piece of masking tape and put on the centering device on the bar to make it fit snug in the tube.

I have used a spirit and didn't care for it compared to the flite. The flite has plenty of torque and is super versatile