Unfortunately I cannot offer guidance as I have yet to experience efficient teamwork with collaboration tools. In last company we used Slack as generic chat client with static channel groups. The current company uses Skype for Business which is the worst chat service in existence.

I have such project in side-projects backlog, I might get to it in few months. It would combine note entry with online collaboration, plus some automation for formal logic / decision making and task scheduling. It would be conceptually similar to 'group mind' as described in this article, except I can only do a prototype and not coorporate-ready tool.