Poor stitching using RAW in photomerge

Hi all,
I shoot with an a900 and would like to stitch the ARW RAW files it produces.
Unfortunately the results are pretty awful. No matter how I import the shots (through bridge, LR or PS4 itself) or the type of RAW (DNG or ARW, even TIFFs) the wizard will align but not stitch the photos together. Plenty of examples can be found in this flickr set:
http://www.flickr.com/photos/35398335@N00/sets/72157613267634565/
Selecting layers -> merge layers also has no effect - it simply flattens the layers without merging them.
However, I have no problems whatsoever if I first convert to JPG and then stitch. Here's an example of that:
http://www.flickr.com/photos/35398335@N00/3252828606/in/set-72157613267634565/
Converting to JPGs isn't a satisfactory solution because I lose so much headroom in PP after the stitch.
Does anyone have any ideas how I can make PS4 produce good stitches when using RAWs?
All ideas much appreciated.

Chris,
I've sent you a link to the 3 RAWs that I managed to stitch correctly as JPGs but incorrectly as RAWs by the email in your profile. They're uploading as I type this - please give me a shout if you don't get it within a few mins.
To the other participants - thanks very much for your suggestions as to exposures etc. I am ONLY having difficulty stitching RAW files. JPG files created from the RAWs with no changes stitch just fine, as can be seen in the example linked to in the first post.
I am unable to work out why PS4 works just fine with JPGs, but refuses to merge files in RAW.
I have tried flattening the document, again it flattens with the seams still visisble.

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I see something peculiar happening on recent stitches.
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Make that three times
Message was edited by: Hudechrome

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Poor stitching using RAW in photomerge

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