After putting some time into playing, I have to take a few things back. I noticed the springs do vary in distance and it appears at 3 different areas just like the arcade game. When I played the other night I could have swore they dropped in the same location every time. I played up to 200,000 points tonight and did notice that at level 9 on up (9 being last level for counter) they appeared to only drop in one fixed location.
Yes, there is a little variation, but it's more a side effect. The springs drop when their x-position is greater than 95. Depending on the speed that can happen at different positions.
Also I did get hit by a spring while exiting the ladder at the safe spot but it may have been a fluke...then again I don't think that area is always safe in the arcade game?
This one is more serious, that spot should always be safe. It can happen from level 4 up. I already made a fix for the next release (which did cost a whopping 9 bytes, ouch).