Interesting...what is R-80 & F-70 oil?
R-80 = "Rear" 80 wt
F-70 = "Front" 70 wt
As for brakes you need to adjust your collars on the brake linkage so that the rear grab first than the front so that you don't push through the corner when braking hard. If your front brakes grab to hard you will lose most to all steering when you hit the brakes coming into a corner. Hope that helps and is what Mracer is meaning.