@gcr0003 thanks for your videos, they are what really allowed me to see 2TC as a transferrable method (i.e. not just for small diameter, smooth trees). The real revelation was your technique of after you stand up, to move your hitch down to get slack in your tether, moving the tether up, then moving the hitch back up. This allows 2TC to be practical on large trees with rough bark.
Where I deviate from your style is that I prefer to keep my foot bungeed into the footloop, and do the same procedure with my footloop as my tether: move the hitch to get slack, flip up the foot tether (I use stiff 11mm rope), then move the hitch back up, all the while keeping my foot in the loop. I found that the open footloop style (take foot in and out each time) footloop was faster on most trees in the daylight, but when I had on huge winter boots and it was dark, it became a lot harder. The "keep foot in" style is a bit slower, but I find that it works for all sizes of trees, and is easy in the dark. It is also faster coming down.
And really thanks to all who have contributed to this thread. I had a similar progression this year to
@NMSbowhunter. In Dec I climbed a tree with my full length LW sticks to ~20 feet, and a doe spotted me and alerted the buck chasing her, they both went on alert so I couldn't shoot (I don't shoot at alert deer with a bow). I finally decided to try what the cool kids were doing and spent the "offseason" (Iowa gun season) practicing 2TC. First time out in the late archery season, I climbed the same tree with 2TC, but was able to get to 25 feet, and this time the buck that walked by had no idea I was there - until it was too late. To be transparent it was a shed buck and I thought it was a doe when I shot but... shooting a deer first time ever hunting with 2TC was pretty awesome.