I never can seem to get my overhead pressing right. Strict press, I've noticed that if you clench your ass cheeks together before you begin the press, it helps me. It's all about creating a solid foundation to press off of. This is the reason you can press more seated than standing. You have to engage your back. Big pressers have big backs. I've tried many different grips and elbow positions. My elbows tend to be down if I'm strict pressing and more in front of me if I'm push pressing.
Lately, in lieu of regular strict pressing, I've started doing Z presses and another one I can't recall what it's called. But basically, you bring it down to your forehead. Then go backwards to the back of your head, then back to your forehead, and then press again. Those are pretty bad ass.