QTR-Quadtone RIP

Hi all.... I've downloaded 2.3.2 and am redoing some curtves and would like to check on 
what folks think is a good workflow.  I've created soft-proofs to use for the Print Space.  
Now, what is the consensus on Source Space?

Are most folks converting to QTR Gray prior to image manipulation or are they staying in 
Gamma 2.2 or 1.8?

Then, are you using your Gray profile for the Souce Space or are you using the Soft-Proof?

Thanks for all answers....

Ed