I went through the same journey to link mine up.
And I made this post to help those that followed.
https://pinside.com/pinball/forum/topic/nba-fastbreak-fanatics-club/page/15#post-6115058
I tried different chips and ultimately these worked for me. Sounds like you got the cable all figured out. And then the only thing is setting the pins to 1 and 2 as I recall.
Let me know if I can help.