We are specifically focusing on rebuilding a congestion control algorithm from the ground up that can better tolerate modern network conditions, including things like high bandwidth, high packet loss, and high latency.
With respect to Grid-FTP, wget2 multi-threading, and other multi-flow approaches: the problem with getting performance increases out of multiple, distinct traffic flows is that you become more and more unfair to other packet traffic as you increase the number of flows you are using. For example, if you use 9 TCP (or any other AIMD) flows to send a file over some link, and a tenth connection is started, you now are taking up to 90% of the available bandwidth (because AIMD flows are designed to be fair amongst themselves).
since you did not know hpn-ssh, google's BBR aproach might also be of interest.
It's a little strange that you "conducted an extensive literature review" of congestion algorithms but you aren't aware of basic common tools like hpn-ssh, wget2's multithreading mode, or GridFTP which is used extensively in particle physics and genetics research communities.