You will be better off with 3/16 laterals. Put 20-25 taps on each lateral and then run it downhill without a mainline. With what you describe you will get high vacuum without a pump. Now you need a bigger evaporator to keep up. You may need to sell some sap to another producer and save that money for a bigger evaporator. 40 taps on high vac. can give you 20+ gallons of syrup and if your sap is at 2% sugar that can be over 860 gal of sap to boil. Are you ready?