if my father in law was alive iam sure he would have the answer,,i think i remember from working with him(had a well drilling and pump business) you need to go deeper as the water table your in hasn't enough head to replenish 10' of water in the pipe means just that,,,know when we drilled a well to get more gal per min we went deeper,,,,,some 1 else may have a better answer as i going on memory only fuzz