I refer you to both the points in my post in your thread... http://www.rcuniverse.com/forum/fb.asp?m=8104629

Hopefully it's a back pressure issue, as I had. Indeed the symptoms sound the same. Starving for fuel after half tank. Hopefully, it's not related to that filter you have, but it could be, they are not that good.

Does it run ok now that it has cooled down and has a full tank? Try running with the fuel cap 'loose', just a turn or so. Does that help? If so, it's the breathing issue.