I have been wrecking my brain with this problem for three days now, so I think I give in and ask for help.
In my game, you play as a sheep with horns that grow when you level up. Wrecking stones and things with your horns make them break a bit, regressing a tick. I can't get the latter part to work.
Clearly the problem is that the horn growth is tied to the level. So even when I decrease the horn growth variable, it grows back up in the second because of the level. I'm just too dumb to see a way around it.
Here's the capx link that illustrates the problem.
Just click to try to break off the horn.