I think you will find this article informative:
Treasury bills are more predictably influenced by the fed funds rate than notes and bonds because Treasury bills and the fed funds rate are competing investments in the money market. The money market is the market for high-quality, short-term debt instruments. Just as individuals put uninvested cash into money market mutual funds, where they can earn interest without putting principal at risk, institutional investors for the same purpose invest directly in the money markets by buying instruments like fed funds and Treasury bills. As investments, fed funds and Treasury bills generally offer comparable yields.
https://www.thestreet.com/story/1156889/1/how-does-the-fed-funds-rate-affect-treasury-bills.html
I think you will find this article informative:
I may have found that informative....over 30 years ago.
I am not sure why you are still chewing that bone trying to salvage something.