All of this is completely logical and obviously proven out over some formal and informal testing. I guess a point that I'm coming to is why am I trying to get the least amount of taps on a 5/16 line as I can? (like Leader recommends, and has been the push in recent years from the exposure I have) I have a new Bush I will be installing this summer with a "twin slope". Its a 5-7% grade going to one corner from two directions. 4.7 acres with 350+ trees, all 14-30 inches. I am going to run a 1" main down the edge running down the grade, and then 3/4" laterals coming to it across the roughly 300 foot with (length of 1" is 800'). These will be 100-150' apart to allow me to run the 5/16 no more than 100 or so feet and with no more than 5-7 trees on each. Its basically a grid pattern because I'm lucky to have the slope both ways. I just feel like I'm going to have way more 'main line' tubing than is necessary since theoretically I 'could' put 75 trees on a 5/16 based on all this 3/16 talk. Is there a limit to all this theory? Obviously from a maintenance standpoint I am far better off with more high tensile supported line, and less 5/16; but should I find a happy medium? I have the same set-up on the other side of the ravine so I guess I'll build a 3/16 system over there just to see what happens! So, should I stack more taps on each 5/16 line then I plan in the hopes of some 'natural' vacuum, or stay the course and do what I planned on? (I write the check tonight for all my supplies!) Ha!