Shimming a hicapa trigger

[TopGunnerz]

Hey everyone, so I have a tm gold match hicapa with a tanio koba grip, nine ball trigger, and stock trigger bar. There is a lot of play up and down with the trigger to grip and frame.

As you can see in the picture there is space between the trigger, frame, and grip, and that the trigger can go up and down.





What's the best way to fix this so that there is no wobble up or down? Would it be better to shim the trigger so it is higher, or lower?