This just in: I'm getting closer.
Got the transparency to work---somehow. And the text looks better now... BUT some characters are still crap. It does -not- look like viewing the raw FLV in Adobe Media Player. See the 'r' and 't' on the green text? But in the blue title everything looks -fine- and I can't figure out why.
Within the realm of FLV I see nothing wrong here. The compression is based on blocks just like MPEG and thus alignment issues with Alpha vs. color are perfectly normal. The typeface being so skinny doesn't help of course. You could perhaps increase the data rate of the clip a bit further and it might improve a tad more, but some characters will always look eroded or flicker at their edges. Also, for such slideshow stuff you should probably consider using native HTML/ CSS/ jQuery. All of what you have there can be done with Adobe Edge or some jQuery authoring...
Not trying to be difficult, but...
1. There's -gotta- be a way to get cleaner text rendering with FLV. Maybe there is a better font or size?
2. Yeah, I -could- do this with jQuery, but it's a 1:30 presentation with about 2 dozen text 'slides'. Doing all those .animation() functions is much more time-consuming.
When I started doing this in Premiere (or Powerpoint) I expected it to take 1/2hr. But getting it into a 'flash' format that doesn't ruin the text is what's taking forever.
Any other ideas?