Same old, same old: Without seeing it, nobody can advise.
Warp stabilizer can do a fairly good job of reducing hand held camera movement on some shots. It won't work at all on others. It all depends on the footage. If you remove a lot of movement the image quality will degrade as the motion is reduced. The more camera motion you remove the softer the image will become and the more the image will be cropped. If you are trying image stabilization and not getting the results you want you have to play with the settings. To learn more about Warp Stabilizer type warp stabilizer in the search help field at the top right corner of AE and study up on the links you will be provided.