Another thing is that you say you loose vacuum going up the long mains. How long and how many taps are you talking. For 3/4" I think the max is supposed to be 1000' and I personally think 750' but that's just my opinion. There is also a max number of taps but I forget what that is, someone will chime in on that. If you use 1" mains you can go farther, but I don't have the tubing notebook at hand so I'm not sure how far of how many taps.