My first climb I got about 15', looked down and my platform was as the base of the tree. I had to use my 2TC foot loop to take tension off of my climbing rope to switch over to the 8, then rappelled, grabbed the platform and climbed again. Both climbs, the Duck worked well, was smooth on the ascension but does have a slight drop when locking back down. Once at the top, it was easy to switch over to the 8 while standing on the platform then rappel down.
Have you tried just coming back down 2TC in reverse? It’s so easy that I am considering not rappelling anymore. I can be back down the tree from hunting height in about the same time and have a lot less gear to mess with. I still have other ways to get down the tree in an emergency, though.