Wonderful resource and a great read. A few responses:
Information flow is a key feature of a lot of mainstream economics and I’ve done some work in this area, so maybe I could point you in the right direction given a more particular question.
Seems from your characterization of his argument that Robert Wright gets the relationship between wealth and zero sum games backwards. Plus sum games trivially increase wealth but higher wealth may promote conspicuous consumption which is a negative sum games in terms of wealth, so this direction seems dubious.
Very curious about the apparent paucity of writing on the relationship of moral progress and personality psychology.
On further reflection, you might want to try Who Gets What and Why by Alvin Roth. Audiobook available. Don’t recall how much of an explicit stress he places on information flow but he does give a good sense of market organization, and how it promotes or inhibits market functioning. The key importance of information flow is at least implicit in this.
Phishing for Phools by Ackerlof and Shiller can be read as counterargument and is a nice read. Slightly heterodox, not fully developed. Audiobook is available.
Economics for the Common Good By Jean Tirole is not bad as a an overview of various aspects about the debate of the moral value of economics written by one of the major figures in academic economics.
Slouching towards utopia which you mention is not very well written in terms of style, at least to my tastes, but makes several interesting points and provides a solid economic history, well informed by (the left wing of) mainstream economics