Just an FYI to the OP. I bought and installed an SC P800 today. Ran calibration image test prints on Canson Baryta Photographique, Ilford Gold Fibre Silk and Hahn Fine Art Baryta Satin. Paper thickness setting to "5," platen gap normal.
ZERO head strikes.
I'm guessing your printer has issues. Do test with Epson Exhibition Fiber... if you get the same head strike behavior Epson will have to take action.
Good luck in sorting it out and please keep us informed as you work toward resolution.
Rand