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If you really want to use doorway pages, you have to be clever about it - make them all manually and COMPLETELY DIFFERENT.
In other words, if I had two of your doorway pages in front of me they shouldn't look at all alike and I shouldn't be able to tell (both from a visual and from a "code" standpoint) that they're doorway pages.
My advice is. Make your own doorways, make them as flat optimized HTML pages, optimized but humanly readable.