How much is the drop? If at least 20' and even better 30' just run 3 laterals of 3/16 all the way and forget the high tensile. If the slope is not that much, use 5/16 laterals and strive for 5-7 taps on each and run them into a 3/4" mainline supported by the HT wire.
If the 3/16 was used, run each the whole distance and run each at the bottom into a manifold with the shurflo on that. An extra 3/16 from either the tank back to the inlet manifold or even just from the shurflo outlet back to the manifold will help you get better vacuum, if the pump to the tank distance is not real far, that is best. On a diaphragm pump you get much better vacuum if you keep the diaphragm wet. They do poorly when dry.
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.