How do I conform my movement speed from a device to another?

Hi everyone, I hope everyone is going well ! I'm currently working on a top down action mobile game where my main mechanic is to dash on ennemies.

I'm planning to let the player upgrade his dash power while evolving in the game so I'm using a bullet behavior which I use to "launch" the player when Dashing.

My main issue is that I've tested my game on 2 computers and the dash speed and force aren't consistent.

On my other laptop, the dash is slower and give the player a shorter distance.

I've attached the file here so you can have a look : drive.google.com/file/d/1aMM6pJqlyf4qa_GkmwzAVu9ZMOvEYmRl/view

I'm fairly new to construct. But I think my issue could comes from the event that's meant to "gradually slow down" the player to mimic a decent deceleration.

Thanks all for your time and help