OK, fixed it! It's a mix of suggestions and first-timing, so forgive my mess:
In the first image you can see I put in the three conditions: button pressed, the laser count is less than or equal to BulletsOnScreen (set to 4, so you can fire that last laser and get to 5), and the player can shoot (is not locked out).
In the second image you can see that if there are 5 lasers (greater than 4, the value of BulletsOnScreen) we lock the firing out by setting CanShoot to 0 for 2 seconds, then unlock it by reverting CanShoot to 1.
In this third image I just leave the movement and destroy after 1 second.
Now that the concept works, I'll fine tune the times and the laser speed.
Thanks for the help!