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Does anyone have issue with shooting loads under 9000 LUP (PSI) in a damascus 1894 declared sound?

No one can tell you over the internet what ammunition may or may not be safe in a given gun.

My Father bought a high condition 1896 vintage AE-Grade 12-gauge, 30-inch, from Osborne & Uland in Seattle during WW-II. From then until he quit hunting after the 1988 season it was his favorite upland shotgun. It digested a lot of 2 3/4-inch Remington Express, Western Super-X, etc. as well as a lot of trap/dove loads. It shows the wear, but still looks fine in my gun safe.