What you are describing is not too different from my own layering setup. The problem with generic layering for me is the core relatively gets too warm compared to the arms&legs. For that reason I never use vests, and I also never use short-sleeve under layers unless it is under a short-sleeve top.
One thing I like that you mention is unzipping on the climbs. I have been doing more of that but not always and not most of the way down. It helps balance the core vs extremities temperatures, you can overall dress a bit warmer that way which means more layers on the arms and legs as well.
Honestly what I really would like is a jacket and tights manufactured with doubled insulation in the arms and legs areas only. Then I would be more balanced temperature-wise.