Geoff, LBJ...looking back (glad it was just 2 days ago), all I did was change Tracking Sensitivity to 5 (I thought it was Minus 5, but I think it is just '5'....nothing else.
Granted I was in Florida sun and big bierds. In the Spoonbill's defense when going/coming close in a small arc window they are a bit faster than one might think....you all know that anyway.
I thought I'd even try going down to Mid in fps, but kept it at H (never H+) the whole time.
NO tracking mode(s). Just AF-C Zone.
It worked on these white bierds with the green smudge on their nose too. I did shoot several of them but the focus was the big pink bierds. (I just love the Spoonbills, so prehistoric but not as much as the Storks, their glide pattern, the sound the flapping wings make when taking off, etc.)
OH OH OH. Steady shot was off.
And Geoff your ducks straight on I believe are a much bigger challenge then these big Spoonies.
Very strange having the a9 in the camper and taking it out only once (sunrise at Titusville) by mistake!