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Hamel--Question: what was the purpose of the M-method, since you mentioned it? Just wondering what the situation was, since you were using spurs--right? Was it a balance issue, long limbwalk, or just nowhere to put a lanyard?
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Many reasons I chose to use the M method/V rig:
The original work plan had me returning to the first TIP once "my half" of the tree was brushed out. This would allow a nice TIP for me to work most of the large spar material. The add on prusik in the system allowed me to slack my original TIP and climb off the second point independently while still having the option and convenience of returning to the original. As it turned out, we modified the plan and had George rig the tops of his side into my rigging point as this kept everything moving away from the power lines.
You can see my rope angle is very flat and unclipping my lanyard to maneuver creates a serious fall/swing hazard. I would be tied in back at the original TIP, but unclipping would basically leave me free climbing the other side of the tree as the severe rope angle would do nothing to protect me. As mentioned by Dylan, the energized lines were also a concern.
Better work positioning in general. Less physical output to hold position. The two large leads that I had the blocks on had moderate lean. The V rig helped me to fight that lean without extra physical strain.
