Files failing to adhere to set data rate on export from Quicktime

I am hoping somebody can shed some light on this.
I open an uncompressed .mov file (output from FinalCut) with Quicktime with the intention of compressing it for the web. After File: export, in the options dialog box, in the field where you can restrict the data rate, I put a number, say 488 kbs/sec. But every time I do this, the finished compressed file has a data rate wildly higher, like 2000 kbs/sec, and so is too large for my purposes.
I feel like I used to do this all the time- I have plenty of .mov files with data rates around 500 kbs/sec that I posted on my website, so this had to have worked at some time in the past.
Anybody? Thanks

Just a bump-

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