Thanks for another update, I'm not a developer but i tried your kernel anyway:
Logic doesn't seem to co-operate very well with this kernel:

In 64bit mode with the 32-bit audio unit bridge:
http://pastebin.com/6wz6hDrY

32Bit mode:
http://pastebin.com/8RfQNnLf

I also got a kernel panic when i tried to open logic

About finder, i can't say i experience any trouble with it at all, i can copy compress i don't get any finder specific crashes in my Console.app either.
(i copied Finder.app from my macbookpro to make sure that my results were genuine)