Sweat management is my biggest suggestion. No matter how prepared you are for being in the tree, if you get sweaty walking there and getting up the tree and don't get that sweat off of you, you freeze. That's been my experience at least. Once I embraced the suck and stripped down and changed at the tree (so yes, you freeze for a minute or two while changing, but so much better being dry after) I stayed warmer, even in lower quality outer layers. This year I've got better clothing layers but plan to still do the same, wear a cheap cotton layer to sweat in while the rest is I'm my pack and change to merino base layer/whatever appropriate over top in the tree( Generally my shirt and my socks get sweatier than my long johns, this the ability to do it in the tree though I may do sock change on the ground, and put the cotton in a Ziploc bag. I don't think any slowing down will stop me sweating all the way, it's just part of how I am, so need to figure out how to deal with it rather than prevent it. I got insulated boots for late season this year too so expect the foot sweat to increase. If anyone has better solutions in this vein that would help OP and myself I'm all ears.