Same transmission in my lobsterboat (not pic here) and maybe about 6000 hours since I had it "rebuilt" also 160 SHP and gets run harder than you I'm sure and Lots more shifting and a lot less oil changes. Oh, and this transmission had been run on oily saltwater for maybe 5 hrs at trolling speed.
I replaced my damper plate last year so decided to open and inspect the transmission myself this time having inspected my sons BW direct drive transmission that spring. I did just that and found nothing wrong whatsoever. Every bearing smooth, bushings unworn, gears new looking, friction plates flat, oil pump unworn, and so on. I did relace the gasket, seal, & Oring kit & a few springs I had no spec. to measure them by, and the crush piece between the rear bearings cause it looked to be a one use item.
So I would not expect to find much to look at in your lightly used and well maintained VelvetDrive.
However that said, in 50+ years in boats, I have been dead in the water twice (outboards excepted of course) and both times have been damper plates. Change it when you look at your transmission, listen with your hatch open at no wake speed, & replace it with one that has a "get home" feature.