After a lot of experimentation, I've landed on 1-sticking up and rappelling down (just because it's a lot faster than 1-sticking back down). This is the fastest, simplest, and safest (most secure feeling to me) climb/descend method I've found so far. Thanks to
@boyne bowhunter and others that pointed me in this direction. It's been a great help.
Carrying multiple sticks just seems too heavy and awkward for me, and hard/noisy to carry them up the tree on a climb.
I bought an 8-pack of WE steps earlier this year and liked them. But they really tear up the soft aspen trunks I climb. Plus lots of fiddling with the ropes and re-camming to get each step properly set. I'm sure more practice would help, but the steps dig out a lot of bark on soft trees. I had the same issue with the teeth on the climbing stand I used to use. I don't like ripping up trees, and a stick (while not perfect) seems to do the best job of this. I will probably end up selling my WE steps.
My stick is a 2-step modified Helium (23" between steps), a single webbing aider (23") attached to the bottom step, and rope mod with a cam cleat. One 30' rope with spliced eye on one end acts as tether AND rappel line. Girth hitch to tree. Hang saddle bridge to the line using a Madrock Safeguard, GriGri, or similar device that does triple duty as a bridge connection, tether adjuster (like a ropeman or prussic), AND rappel friction device. This eliminates a separate tether and linemans belt (and associated hardware), and separate hang connection & adjuster. You are always connected to the tree. Just have to pay attention to managing tether slack as you climb. A lightweight linemans belt can be carried and used if necessary to bypass branches. This is rare on aspens so I don't carry one anymore.
Now I'm searching for the perfect small lightweight inexpensive rappel device that I can also hang from on the tether, and use it as an adjuster. Any other devices out there that can do this (similar to Safeguard or GriGri)? Maybe the Black Diamond ATC Pilot with an autoblock prussic?