Just to clarify, I was saying use a porty to have a midline connection point on the rope, not for lowering with.
The only knot I know of off hand that has a 50% reduction in poly would be an overhand knot. A bowline still retains around 70% (30% reduction).
It's strength will be reduced significantly. To the point where most would find it to be more effective to just order a poly rope.
For pulling trees you can run it over a limb, down to the base of the tree, and have a spliced eye and a shackle to terminate that end. A porta wrap on whatever...
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