Clipping in Photoshop CS3 rendered Differently in Lightroom 1.4.1

I called Adobe Tech Support in an attempt to get an answer to my question about why Lightroom (version 1.4.1) seems to show more clipping of an image than viewing clipping of the same image in Photoshop CS3 by using a curves adjustment (show clipping box checked). They did not give me a reasonable answer.
I typically import my images into Lightroom, then make adjustments there, export to CS3 as 16-bit tiffs in ProPhoto RGB Colorspace, then make further color and contrast adjustments in Photoshop. My monitor is calibrated using a Colorvision Spyder2. Color management settings in Photoshop are as follows: ProPhoto RGB Colorspace, US Web Coated (SWOP) v 2, Gray Dot Gain 20%, Spot Dot Gain 20%, Color Management Policies are to preserve embedded profiles for RGB, CMYK, and Gray, profile mismatches are to ask when opening and when pasting, and to ask when opening images with missing profiles; Conversion options are Engine Adobe (ACE), Intent Relative Colormetric, Use Black Point Compensation checked, Use Dither (8-bit/channel images). There are no items checked under advanced controls.
I view proof setup using the same paper profile in CS3 and the print module of Lightroom (perceptual intent, black point compensation checked, simulate paper color and simulate black ink options are unchecked unless being viewed full screen) Sometimes I also use the rendering intent of relative colormetric with black point compensation checked. I am seeing evidence of more clipping almost always in Lightroom (Develop and Library Modules both) than in Photoshop CS3. I understand that the Library Module uses Adobe RGB colorspace rather than ProPhoto, but I still see more clipping in the Develop Module view of the same tiff than its clipping representation in Photoshop CS3. There is a substantial difference (not a small one) in the amount of clipping shown.
I understand that Lightroom Develop Module is using a Perceptual intent and that the default option in Photoshop is absolute colormetric, but I still do not think this completely explains the problem, especially since I have the soft proofing set up to use perceptual intent most often. By the way, I never check the box for preserve RGB numbers.
Can anyone explain why the difference in clipping shown and which one should be taken as more accurate: Lightroom clipping rendering or Photoshop CS3 clipping rendering?
Please note that I ultimately export the final images as jpegs (8-bit) in srgb colorspace before posting on the web. These photos are ultimately ordered from an online printer (usually from Mpix).
Thanks for any help you can give me. Best wishes.
Bob

Hi,
Thanks for your responses. In answer to Jao's questions:
Yes, I turn on the clipping warnings in Lighroom (shortcut j). I am viewing a 16-bit tiff in ProPhoto RGB (that has made the "round trip" from Lightroom to Photoshop CS3 and back again to Lightroom) in Lightroom using the clipping warnings. The clipping shown in CS3 using the adjustment, curves, show clippings are much less than what is shown using the clipping warnings of the same 16-bit tiff in Lightroom.
My workflow is to import Canon Raw (using sRGB, rather than Adobe RGB) into Lightroom. Make color, sharpening, tone, ect. adjustments in Lightroom, then export to Photoshop CS3 as a 16-bit tiff in ProPhoto RGB colorspace. I make additional adjustments to color, tone, skin tones, noise, touchup, sharpening, ect. and then save the file. It reappears again in Lightroom. When I have the clipping warnings on (shortcut j), this tiff appears to have considerably more clipping than on a curves layer showing clipping in Photoshop. Ultimately, I then export these same photos as jpeg (8-bit)in srgb and post to the web where they can be ordered from an online printing service such as Mpix.
Thanks for any help you can give me.
Bob

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