Very Low Audio in DVD Studio

FCP project with 20 short timelines -- all single video tracks, stereo audio tracks, two filters: EQ (to pump highs and lows), Compression (to make it pop just below zero DB), and sometimes a little gain.
All rendered, of course. The 20 timelines go two directions in Compressor: to H.264 via a Matrox Mini, and to the standard Best DVD compressor which makes the M2V video and the AC3 audio files. The H.264 file is the same audio level as the FCP timelines -- pretty hot at just below zero DB. BUT, the DVD audio files are way low -- maybe a third of the original audio. Why? Is Compressor or DVD Studio Pro "interpreting" the audio somehow? Almost feels its adding a limiter to the AC3 file.

Totally agree Steve - the BBC have said the same to me in the past
Dialogue Normalization is a funny old setting - it actually refers to the amount of attenuation applied to the audio source with -31db meaning no attenuation, which should mean that the volume of the audio is preserved throughout the compression process.
There's a lot more to this, of course, have a look here for some plain explanations:
http://www.hometheaterhifi.com/volume72/feature-article-dialog-normalization-6-2000.html

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    IDT High Definition Audio CODEC v. 6.10.6395.0.  5/21/ 2012
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