Currently pumping 135' uphill from cistern to houses and barns thru 1100+' of 2" pipe from cisturn/hand dug well (12gpm). Want to ease pressure (use) on 1/2h subm pump (80-110lb on/off) and fill plastic (1500 g) cistern in barn at 5#of pressure, same elevation as houses. Current set up only get minimal 30#pressure at houses/barns. want to get 50# from new cistern to all spigots. what sort of pump/tank arrangement reccommended at the barn cistern to give me that constant pressure.