Stop trying to force open the hips. This will come naturally. In fact, fight the temptation to open them because it sounds like you are way too far open. And don't fight your wrists. That is the last part of the swing that applies the hit. Finally, make sure your upper and lower half are in sync. It should feel like everything is moving at the same time. If you get too far out of sync and the lower half opens too much before the upper you'll loose power. Good luck.