I recently replaced 2 rocker switches in an existing electrical box and they are both crooked (inward) and look like garbage. They also don't feel that nice as they are indented and not flush, so honestly they don't function all that great either. It's a problem specific to this electrical switch outlet box. I've tried every adjustment I can think of, but nothing has worked. I tried:

• Making sure the copper wiring attached wasn't pulling the switch to 1 side
• Making sure the screws mounting the switch were tight but not over-tightened
• Checked both switches to make sure tabs were flat and not bent

I did notice the electrical box is loose in the wall and torqued a bit and not flush with the wall. The system of tightening the switches which pulls on the drywall and should pull the box forward isn't quite working well either. The drywall starts to press in and almost get destroyed before the electrical box pulls flush. The box is the type mounted with nails on the top and bottom (I can see them and a little rusted). I can move the box around say 1/4 to 1/2" with my fingers.

I would guess that people that do this type of work as a trade have specific practices on the 'right' way to fix this and something that doesn't break code. Here are the things I'm guessing might fix it:

• Add some type of shim behind the light switch flanges to help make the mount truly flush as maybe the drywall is soft and from the pictures a bit worn away
• Use spacers like washers behind the switch to pull it out and more flush (I'm not sure if that's a bad practice or against code)
• Call a drywall and electrical contractor to cut open the drywall, remove and replace with a new electrical box, and repair the drywall (I really hope not as that's expensive, but if that's the only way to fix, then that's what will have to be done).
• Some other proper way to fix I haven't considered

How can I get these switches to mount flush and protrude correctly from the light switch cover please?

EDIT: The 1st picture shows the torqued switches fully tightened and installed. The 2nd picture was taken after I had loosed the screws on the switches. I probably should have used a different picture or clarified. That picture is to show the drywall to electrical box condition for helping show the bare parts. When fully installed those switch mount screws are fully tightened and pressed on the drywall.