How do I properly edit a selection prior to saving as an alpha channel?

I thought that I could just use Quick Mask to manually paint with 100% black or 100% white to adjust the boundaries of the selection and then save that final selection as my alpha channel.
However, I'm discovering that when I do this, I end up getting a weird grey-ish artificat (which incidentally, I can't figure out how to remove it).
I'd appreciate if someone could tell me how I should be properly modifying the selection prior to actually saving it.
Thanks!

Yes, that faint tinge is the artifact that I'm trying to eliminate, and it only appears in the areas where I have attempted to manually alter the selection.
BTW- I posted this on the other thread, which is basically, how do I get rid of this once it has happened because I have a ton of files in which this occured, anyway, what I posted is that even if I use the Contract option of Select Modify, I am still getting this artificat.
Again, the artifact always corresponds to the area of the selection that I changed (either manually using the brush in Quick Mask or semi-automatically through Select Modify, Contract X pixels).
So it doesn't seem like it would be actually related to the brush settings, or can brush settings effect the Select Modify option as well?
Either way, I'm going to try resetting the brush now.
Thanks for continuing to respond.
This is driving me nuts.
dk
EDIT:
I just realize there is an additional confound. Photoshop displays a grey-ish artifact around the selection that was modified, whether "correct" or "incorrect."
By which I mean, initially, it seems like maybe I wasn't using pure black and/or white for adjusting the selection, and this would show as a grey-ish artifact in the alpha channel which would in turn render in 3ds Max (I'm using the alpha channel to create the illusion of leaves and petals, so I need completely transparent space around the object).
When I attempted to adjust the selection using Select Modify, Contract, I got pretty much the same grey-ish artifact, which I took to be an indication that the alpha channel was still not 100% transparent as I desired.
Then I got to thinking and decided to check in 3ds Max, and discovered that I can't use that grey-ish tinge around the object as indication of whether the selection was properly modified or not because whether manually painted or automatically modified using something like Select Modify Contract, the alpha channel registers the changes in the same grey-ish tinge.
So I'm going to try doing another Quick Mask with 100% black and then check in 3ds Max because I can't actually see the difference in Photoshop.

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