I think this is the best one,
you did really well especially considering your lenses, birders need the best glass.
I stumbled across a birding site this week, it seems that a 300mm prime plus a 1.4x teleconverter is the most popular, a 80-400 zoom is controversial and a 600mm prime is king but very expensive.
Looks like you did a good job of getting pretty close though, well done
