You have run into a problem though. Although your method for rolling harriers works, It WONT WORK for rolling circles,and it WONT work for PERFECT rolling harriers like you stated earlier. YOU CANNOT do a PERFECT rolling anything without rudder. I repeat, CANNOT. Lets take for instance your average 4 outside roll rolling circle. It is very important to not only use the rudder while in knife edge, but also in level or inverted flight to turn the aircraft. The same goes true with a Rolling harrier, but really isnt as important since the planes are rolling so fast. All the TOC guys use slightly different tecniques, but basicall all the manuvers are done the same way. Oh, and ALL of the TOC and XFC and whatever else guys use rudder while rolling.