The carbs on these smaller gassers need filtering more so than the typical Walbro carb. When a Walbro gets dirty it's rather simple to clean it. I'm sure it would be a difficult job to clean one of these 10GX carbs so I'd rather have a clunk or an inline filter clog before the carb.
Also, I use the felt clunk on the 15GX in a 14oz tank with no troubles. Using the nut weight on the felt clunk as you did will work to keep the clunk down and moving back&forth.

Here is the sintered clunk: http://www3.towerhobbies.com/cgi-bin...?&P=9&I=LXD741

If you can find a Dubro final filter use that or a Sullivan crap-trap
http://www3.towerhobbies.com/cgi-bin...?&I=LXD742&P=7
http://www3.towerhobbies.com/cgi-bin...?&P=9&I=LXFU76