Nailing Panel Molding onto Drywall?

I'm trying to nail some panel molding frames onto some drywall. Now the walls aren't perfectly straight. So that means the panel molding can't lay onto it straight. They would have to be held onto the wall with finishing nails (all normal from what I read). The thing is the finishing nails dont grip onto the drywall especially at the parts where the wall bends just a little bit. So what can I use? From what I read finishing nails are normal, but then again they aren't made to hold onto drywall. I also use liquid nails behind the back of the panel molding to hold onto the wall (again normal to do) but how do you hold the panel molding onto the wall when the nails wont stay IN the wall?