Realistically, the worst friction loss I believe we will see is in the snatch block back to rig scenario. I'm using a very low friction snatch block and if you look at the loads on that set up, it is very low or enough to ignore.If you give a good tug between points 2 and 3 toward point 1 do the values equal out at 1, 2, and 4? Just something I thought of to try and combat the friction losses (even though in the real world there will be friction losses)