Quoted from grandy:
It probably has nothing to do with your spring. (check the manual but i do believe it should be the strongest or next to strongest spring.) My taxi spinout problems had to do with wear in the shooter lane that was causing a bounce, and a very cracked spinout ramp that was too shaky.
1. Make sure that the spinout ramp and the wireform that go up to it from the plunger are all tightly screwed into place. Shake and wobble can have a bigger impact that you'd think.
2. Ensure that your plunger is in line with the ball (if it's offset, you may be sending the ball up at an angle instead of straight).
3. If you're still having issues, take a slo-mo video of the plunge going up and you may be able to see what is taking the momentum out of the ball. (this is how i discovered my shooter lane issue).
good luck!
I appreciate the response. Let me answer some of what I have done.
"1. Make sure that the spinout ramp and the wireform that go up to it from the plunger are all tightly screwed into place. Shake and wobble can have a bigger impact that you'd think."
Started with a loose broken spinout ramp and was definitely a problem. I have secured it in place then got a brand new one, so it is now very solid. Still had the issue.
"2. Ensure that your plunger is in line with the ball (if it's offset, you may be sending the ball up at an angle instead of straight)."
Definitely still an issue. The plunger hits high and an bit to the right of the ball. I temporarily tried raising the bottom of the playfield to get the plunger lower on the ball. At one point the ball went around the cup ~20 times! It seems really sensitive to the height. I have not been able to make a leftward adjustment yet.
"3. If you're still having issues, take a slo-mo video of the plunge going up and you may be able to see what is taking the momentum out of the ball. (this is how i discovered my shooter lane issue)."
I will have to do that next.