Ghost Block Generator (Using slime blocks)

*What I expected to happen was...
have a fence post stop the player from throwing the ender pearl and then you walk forward activating a pressure plate that would pull the fence to the side and push a line of slime blocks up 1 tick later to launch the ender pearl further than usual.

What actually happened was...:
The contraption worked (not as well as I had hope though), but every so often (quite infrequently) when I would step on the pressure plate the piston pull the fence to the side would pull the real block away but the slime blocks would pull a ghost version down "duping" the block and then it could be pushed back up and fed into a long line of ghost blocks if the glitch was repeater (this could be achieved with a 3 tick repeater clock).

Steps to Reproduce:
0. Image(s) attached show a full view of it
*Not for building "This is all written assuming your always facing the same way for easy of explanation."
1. Place an upwards facing sticky piston with a slime block on top and a repeater on 2 ticks facing directly into it
2. Place a block behind the the repeater with a redstone dust on top of it to power the the repeater and add another dust to the left (also on a block)
3. The redstone of the left should face into a block (place it) with a torch on the back
4. A sticky piston facing to the right on top of the the torch with what ever block you want to make a ghost duplicate of (must be movable via piston) on the face of the piston
5. Add a redstone clock to power the the redstone (3 tick repeater facing one way and another 3 tick facing back in a loop (Advise to power the redstone via a block instead of by attaching the repeater)
6. Send a 1 tick pulse into the clock to start it up and wait, it can take a while before it starts working (it might be caused by lag so keep that in mind)
*I get an average of 20-30 fps