Base curve selection

We have a 4900 ProK5 conversion and I’m wanting to make curves for both of the new Hahnemuhle Agave and Hemp papers. How do I make a good selection of a base curve. Traditionally I have used the Hahnemuhle Rag as a start. Has anybody made these and if so what base did you use?

Pretty much any curve that’s remotely close will work just fine. I used HPR308 to linearized that paper the other week and it worked well.