Folder Actions Performance and Repeat Loops

I have a Script that takes downloaded eml files and then opens them ready to send in Outlook. I works in the Script Debugger but in a folder action, it opens every email twice.

It opens quickly on some Mac’s but others are very slow to run the Automator Script.

Lastly, it also leaves a copy in the Drafts folder, for no reason I can see.

Any help would be appreciated.

use AppleScript version "2.4" -- Yosemite (10.10) or later
use scripting additions

set ext to "slademl"
set extNew to "eml"

tell application "Finder"
	set filesToRename to files of folder "Macintosh HD:Users:julianabbs:Downloads" whose name ends with ext
	repeat with aFile in filesToRename
		set fileName to name of aFile
		set name of aFile to text 1 thru -8 of fileName & extNew
	end repeat
end tell
tell application "Finder"
	set mlist to (every file of folder "Macintosh HD:Users:julianabbs:downloads" whose name extension is extNew) as alias list
	repeat with this_file in mlist
		tell application "Microsoft Outlook"
			open this_file
			set theMessage to item 1 of (get current messages)
			set theSource to source of theMessage
			set theAccount to default account
			set newmessage to make new outgoing message with properties {account:theAccount, source:theSource}
			close window 1 saving no
			open newmessage
		end tell
	end repeat
	delete (every item of folder ("Macintosh HD:Users:julianabbs:downloads") whose name ends with ".eml")
end tell