Email Filter Rules Blues

I'm having a longstanding problem with the provided Filter Rules for sorting my incoming email.   Please let me know if what I am trying to do should work and I am actually reporting a bug, or if there is even a way to accomplish what I am expecting with the rules as implemented.

First, I am expecting that email filter rules work from top to bottom. The arrow pointing down on the far right with the associated mouse-over tool-tip "Process Subsequent Rules" seems to support this assumption.

I then expect that, like a real world filter, items that are filtered out by one filter should not then pass through to a subsequent filter, as they have been dealt with - especially if that action is a "Move to Folder".  But this is not the case, as those "moved" emails DO continue to flow through.

For example, if my first filter moves all emails including "support@" to a designated "Support" folder, no subsequent filter should be able to see/process an email from "support@microsquish"; yet if any subsequent filter now tries to match and move all emails including the "@microsquish" string into an "Unimportant from Microsquish" folder, any emails from "support@microsquish" are DUPLICATED in that folder.

In an effort to overcome this behavior, I have added to ALL my cascading filters a second Action after the first "Move to Folder" Action: "Discard".  I would now expect that any emails that match my conditions are first moved into the designated 'Move to' folder, and then explicitly deleted, thus stopping them from being considered in the subsequent Filters.

But that doesn't work either.

Indeed, all original incoming emails are still considered when applying all subsequent filters.  My final filter, which merely checks for a Sender/From containing "@" (everything left over after all previous filtering), and then moves those emails to a folder named "Filtered OUT" should only be able to see and compare those emails which did NOT match any of the previous explicitly "white-listed" conditions.  But instead, my "Filtered OUT" folder contains duplicates of every single email I receive.  

Someone please tell me there's actually a way to accomplish the behavior I'm expecting, and I'm just missing a checkbox somewhere...right?

Thank you.