H.264 settings for TV Broadcast

Hello,

I am sending over the internet a 30sec TVC to a company that will distribute it to the TV networks. They have asked for H.264.

I have made the highest quality H.264 file I could in compressor (I am running the latest compressor)

The file ended up having a data rate of 8mbs, and being about 60 mb in size (the TVC is a mixture of Full screen talking heads filmed against a fairly plain backgrop dissolving with 12 frame dissolves to titles on a solid background - so not a lot of movement etc to compress in the footage)

I was surprised by the small file size and data rate. Am I missing something in the settings?

Resolution is Anamorphic 16:9, 720 x 576 (PAL),
I used the variable bit rate encoding setting set to the highest quality,
Key frame was set to every 25 frames (source footage is 25fps)
Audio is PCM, 48 kHz stereo.

Should I instead use the setting where I can set the data rate rather than the best quality setting. If so what data rate setting to you recommend.

Is there anything else I can do to up the quality?

It's a FCP DV project exported to QT None Compression intermediate file before being taken in to Compressor.

You comments would be very much appreciated.

Best Regards,

Sarah