Well, well, well.... isn't this interesting.
Webra Austria informs me in no uncertain terms that the TNII carburetor is designed to be used only withOUT pressure, of any kind, even muffler pressure. With pressure, either from the muffler or from a pump, they direct use of the Promix carb, which, they point out, should not be used in the absence of pressure.
I am awaiting a response from Horizon Hobby as to why they advertise the webra 120 with pump is sold with the TNII carb!
It sounds as if reshaping the law speed needle on the TNII carb will not make it work properly with pressure.
This also suggests to me that even running this engine with a Cline regulator, which uses crankcase pressure, is not going to give best performance.