Thanks. I'll try that next time and will also try center point only as lijoec suggested. Hope I'll get the hang of this eventually.
Ctr point only for BIF is REALLY difficult. For birds walking around/sitting on branches, that's the one I'll use. But if I'm tracking across the sky, I go zone(but not all pts). I'm too shaky/wobbly. Also, keep in mind that the dual cross points may only work with f5.6 lenses. So If you're using f8 combos you're probably losing a level of contrast. I noticed one of your birds was black and white with little detail for the camera to lock onto. That's a tough bird for the camera to lock on in even the best case scenarios.
Also, are you using back button focus? I find it helps when using AI SERVO. Keeping your thumb on focus while you hit the shutter button means the AF system never stops working it's algorithm. I don't know about you but I find it difficult to hit the shutter button and release just enough to keep it half pressed. If you take your index finger off completely you have to go back to half pressing to actuate AF, loosing even just a split second.
Anywho, keep us posted.