I think you need to be addressing the real problem first!! Your plane is trying to tell you there is a reason your setup is vibrating badly enough to foam the tanks. Your fan is most likely out of balance, or the shroud is not isolated from the mounting rails etc. I ran D/F for years, and never had foaming problems. That much vibration will kill your servo's and the rest of your electronics in short order also. I truly beleive that if you get to the real root of the vibration and fix that first, your foaming problem will be gone. That said, Harley's discription of the header tank setup with the "clunkline dead center and no clunk" is exactly the same thing i used to do also. It worked perfectly.