Advice on cutting file size in half?

Got a problem re: compression for web video - got a 1:30 (animation codec - mix of Livetype and DV video) sequence, exported QT conversion, Mpeg 4, h264, data rate 150, 176 x 144, 200 keyframe, mono audio, 30 fps.
Given the above settings, when I open the finished mpeg4 file in QT 7, it plays the audio, but NO video shows at all. Did this twice. Besides, it's always at 3.1mb.
I obviously, need advice on best way/settings to get this video down...I have a good 320 x 240 mpeg 4 version which works nice at 4.1 mb, but I need an alternate version at under 2 mb, which is why I made the data rate so low on this one, ie 150. Still I CAN'T get this thing below 3.1 mb.
Thanks
KB

If you were to export your timeline to a QuickTime movie (at current settings), you could drop that in Compressor and try a whole bunch of different variation to see what works best for you.
One additional thing I'd try for your smaller file is to decrease the framerate of the encoded file to 15 (or even 10) fps. This is where creating a bunch of presets in Compressor really comes in handy.
I believe that the data rate you're seeing in QuickTime player includes the audio, whereas the setting of 150 that you set during the QuickTime conversion was the video rate only.

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