Dark images for greyscale and lab luminous channel

For my B&W conversion I normally use the luminous channel from lab. I do this in photoshop of course because Aperture can't. All the photos come out darker in Aperture then in PS. Actually any greyscale image (non-RGB) comes out darker. It's just not playing nice with anything but RGB. Of course my photos end up being much larger then they need to be with 3 channels instead of 1.

Ive now done 4 re-installs; first one no change, second one cured lab color fault but introduced new ones, third one lab color fault returned plus the new ones from the second. After the fourth one Im now back where I started on Monday night, no apparent faults other than lab color. Ive installed all updates including 4.4.1, Im thinking that I might run with this as the affected channel is not the one required for the sharpening process. Any thoughts? This seems the best option for the moment; as I intend a pc re-build in the next six months or so.
Mike

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