Thank you Dr. Tim for a bunch of helpful information. Clearly there must be differences in my woods and my neighbors woods. Although the trees all look to be about the same size it sounds like even a slight difference can result in higher sap/sugar yield. After fighting with back issues for several days I was able to go check my lines today to see why my vacuum was so low. Way in the back corner (where the snow is the deepest) I/we missed about 50 spouts on a short mainline. I cannot believe I'm the first to make this mistake (haha). I'm running 26 inches now so there still is some smaller micro leaks somewhere but I'm not going to worry about it now. My sap is still testing 2.3% today so I am very happy with that. I ordered my CV2 spouts months before the season started and they came in the day after I finished tapping. We did not want to wait any longer. I'm using clear smart spouts this year in my woods. 5000 of the trees have 6 year old drops so I know i'm going to pay the price for this. My free help flew in from Alaska so we had to tap when we did.
Spud