How do I make a bullet bounce forever?

I'm trying to build a boulder sprite with bullet behavior that bounces after the player in a 2D platformer. I want the boulder to bounce forever as it's chasing the player, and maintain the same speed and bounce height.

I've set the bullet behavior to the following, but the boulder slows down and the bounce height decreases over time (which is realistic, but not desired)

I tried added the following logic, but the results are inconsistent -- sometimes the boulder will slow down, sometimes it will speed up, even both on the same run.

Any thoughts?

i would make it that

everytick set speed to boulder.bullet.speed.

simple and might work so it never diviates in speed