I normally like AMD processors, I in fact run one in my current rig. That said, the A- series mobiles have always seemed a bit lacking. Are you keeping the Turbocore/turboboost features on? If so, don't, and swap to manually setting your processors core values. Turbocore can, and often does, cause pretty ugly FPS drops if it misreads how much power you need.

Now, I'm only passingly familiar with AMD notebook processors, so if someone else reading this has other advice, feel free to chime in. My big concern is I don't have a solid grasp on how tubrocore interacts with integrated GPU.