So here's my situation, I have about 400 ft of 3/4 mainline with about 1/2℅ slope on it, and all my laterals are between 50-75 ft with roughly the same amount of slope. About 80 taps in total. I'm running a suflow pump like many people on the forum and have 15 inches of vaccum on my second lateral closest to the pump. The problem is most of my laterals are full of sap, but it doesn't seem to flow into my mainline that well. I would like to think that 15 inches of vaccum would help it along a little better than it actually is with such little grade change, am I wrong? I waited by my pump for about 10 minutes after I fixed a small leak and wasn't pulling any sap even with my laterals full. Any ideas on fixing my problem