Hej,
I use fudgey script now, I set macro but auto AF, slow mode (so it adjust AF before the shoot).
The distance between bird and cam is very small, between 10 and 30 cm usually (thus macro mode needed).
I now use 3s burst mode too.
The script setting are kinda the default ones, I just change to : "chroma channel", "slow mode", "3s burst" and between 20 and 30 threshold.
My cam is in Av mode always, so I just get the fastest speed for the available light.
Winter is also good for the birds which don't migrate : you can feed them and get a nice spot easily.