Good trigger mechanism for a hog trap?

Hey guys, I've been pre-bating my trap out there and it is a box trap. It is a 4'x8' size

It has a hinged door that opens side way.

But the problem is I need a different trigger mechanism from what I'm using it right now...

I put a trip mechanism and I think coons are keep messing with it or I don't know.

I went out next morning and the door was shut but no pig but some of the corns were gone but not significant amount tho so I assumed coons triggered trip wire...

I've been thinking about putting a rooting trigger or pressure trigger with plywood but don't know which one to go with...

Any recommendation or any other trigger recommendation that can minimize coon invasion? lol...