High pitch mains cause turbulence in the line. Get a copy of Steve Childs' (Cornell Maple Specialist) tubing notebook, it will cover the design possibilities for your situation.
In general you are best off making the main at 2% slope, gradually climbing the contour lines and make the lateral as steep as possible. If steep enough they can be much longer than 100' with no issue. In fact, if 40% slope you can go to about 25 taps/lat. and get good natural vacuum. Some doing this even run 400'+ with good results.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.