Canon 5D Mark II data rate drop

Trying to work in the original source format H.264 with clips from Canon 5D Mark II in FCP to show off the excellent resolution of the cam's video format.
Everything looks great in the exported self-contained QT movie (aka FCP Movie) of video clips only--data rate nice and high at 42.xx mbits/sec. Then I add text clips, and the data rate (and resulting footage quality) plummets to 20.xx mbits/sec or lower depending upon how much text I've added and whether the text overlays footage clips.
Sequences where I've not added any text retain the original data rate of the source files (42.xx when played back in QT) and look fantastic. But those with text get as blocky as the data rate drop involved.
Any idea why FCP is doing this to these Canon 5D H.264 sequences when text is added??
Mary Lynn

Yes, thank you both for your responses. Quite familiar with ProRes conversion workflows and H.264 delivery, etc.
What we are trying to do is show clients precisely what the footage looks like right out of the Canon 5D, which is pretty fantastic. FCP will actually create a sequence that matches the 40 mbits/sec long GOP H.264 right out of the digital SLR cam, and will maintain the data rate and great quality in exported self-contained QT movies consisting of hard cuts between multiple clips...that is until text is added.
But it looks like for now we'll just have to transcode and show clients that instead. (Although hopefully future versions of FCP will allow us to edit Canon's 5D variant of H.264 natively!?)
Thank you again for your responses!
ML

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