tks all for your valuable help
I will doublecheck the tank installation and cushion to avoid foaming, the prop is balanced already, i have 2 questions, the altitude in here is 7500ft how does that affects ?, and i have an exhaust deflector can that cause the temperature or popping ?, also if the fuel is foaming even with a richer needle set should the engine be still ejecting unburnt fuel ?. I have setup up the idle screw a lot of times and still see a troubled transition from low rpm to highs. Another observation was that when the tank is at 1/4 level the situation improves in terms of smoothness but engine still overheated according to other people on the flying field. How can i know to recognize that the engine is overheated or not ?