Digital BW, The Print

I apologize if this post is too much off topic.

I am interested in exploring Pyro development for my 4x5 sheet film 
negatives to be scanned for Piezo printing. I shoot HP5+, process my 
film in a Jobo CPP-2 rotary processor, scan on a Polaroid SprintScan 
45 Ultra, then print using PiezographyBW on an Epson 1280 and an 
Epson 7600. I plan on using the Pyro ABC (Rollo Pyro) formulation.

This will be my initial foray into Pyro development. I have a couple 
of questions for any experienced Pyro users out there.

1) With respect to scanning, is the staining effect of Pyro 
development beneficial or detrimental?

2) Any recommendations for starting development times for HP5+ and 
Rollo Pyro?

3) In a rotary processor, should I pre-soak, and for how long?

Any input from experienced pyro users is very much appreciated. 
Thanks.