Hello Jimmy, I'm the author of LaddieAlpha, and I maintain DLPlus. You are welcome to look at any of that source to understand the protocol.
I haven't had any issue with flow control. Set DSR and CTS so that unpatched TS-DOS "cable detect" insanity is satisfied. Set baud to 19200, since that's what a TPDD-2 uses. You can support 9600 baud if you want. There is no flow control for TPDD per se. It's a request-response protocol. There's no need for flow control because neither side can be "overrun" in a request response protocol like TPDD file access protocol. That said, if you don't respond quickly enough to TS-DOS it will time out on the tpdd service. Good luck with your project, -- John.
