Here is what I have done so far. The conductor line starting at the highest elevation I did 1" over 1" for about 150 feet then went 1.25 over 1.25 for another 250 feet and then we 1.5 over 1.25 for the rest. The total distance for this conductor is 800 feet with an elevation drop of 35 feet. All mains off the conductor are 1" and run parallel with the slope and are running various lengths off the conductor.