The basic thing you're going to find is that any of these strategies will work as long as you don't divide your time too broadly over too many books or use something really worthless.
If you're already doing TPR, just do TPR and put 100% of your effort into it.
If you want to do something different, pick what any of the other folks are recommending and put 100% effort into it. It's not the prep company that's going to take the test for you.
From my experience, I found that TPR was solid material. It helped me relearn a lot of material, due to 8 years out of college and I improved 4 points from low 30s to mid 30s.