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Hi Graham,
I think your issue looks to be insulation (unless you have this inside the box??), I had quite pleasing results with my Camera (Canon 600D) in my first Gary Honis Clone (except that it sheared out the metal in my T Adaptor) so I am doing Mark II of the cooler box.
Mark II moved the Peltier cooler to the rear of the box and changed the insulation to white foam (I used blue sealed cell foam in the first box and it just didn't keep the heat out) I used a wider aluminum bracket from the cooler to the camera mounting hole and a blower to move more air around the box and keep an even temp throughout.
I have two pictures of Mark II still being built (Ignore the chunks of foam as the glue is still setting before I can cut it off and sand it down) as well as two 10 minute dark frames, one cooled in the first box the other not cooled at all, you can see a big difference in the hot pixels.
I agree the plastic of the camera body does limit the transfer of heat out of the chip however when the box temp is ~4-5'C it still makes a hugh difference.
As a side I am using the same Peltier as you, looks like it was from a Dick Smiths portable fridge for $29 if I'm not mistaken LOL. So this should get you similare results if done right.
You have my details already so if you want more info just give me a yell.
Cheers
Anthony
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