Blotches on display due to pressure

I was going to search for this first and then add to an existing topic (sure there must be one), but since the search facility has disappeared.....
I'm now on my second replacement screen for a 15" MacBook, which has been due to strange blotches appearing on the screen, a little like fingerprints, and more noticeable against a white background. These were in the centre and were a massive distraction when working on graphics etc.
When I last picked up my Mac, the guys at the service centre stated that they'd appeared due to pressure against the screen when the lid is closed. I cycle with my Mac, but it's in a very, very well padded Crumpler rucksack. It couldn't be any more protected.
The engineer showed me the insides of another screen/lid which had five or six little white pads surrounding the apple logo, and said that it was the pressure of these on the screen that had caused the marks.
This was only a couple of months ago and i'm now starting to very faintly see two more marks appearing on my brand new screen!
Can't complain about the AppleCare service when it came to the replacement, but how many times are they prepared to change this screen... is this something I've just got to accept?? I'm really looking after my Mac, I love this machine, but sometimes I despair about the quality of some of the components (and Apple's updates (10.5.3 for killing my Airport for example)).
Any comments/advice?

it is fairly new, better than my last bag, which was also good, but the problem occurred nonetheless. this crumpler bag couldn't be better padded, and the MacBook is meant to be portable... so what should i carry it in??

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