Tricks to shooting with the 1.4x TC and 50-200?

I think speed was the primary issue. While I haven't done a full test of the combo, I did put the 1.4 on my 50-200 yesterday, turn on IS and try to shoot a bit faster. I'm mostly happy with the results. Ultimately, I think I'll be more judicious with the 1.4 -- only using it when there's tons of light.

The photo below was shot at 239mm f4.8 200ISO 1/640

A flickr set with more green heron shots, mostly without the 1.4: http://www.flickr.com/photos/37186408@N05/sets/72157631059071688/