For older boats the published dry weights were grossly understated. Our 2009 R-25 Classic, loaded with our normal gear, was well over 1,000 pounds above published dry weight. On scales the R-25 (less trailer weight) came in at 7,600 pounds with mostly empty tanks.
Our 2017 Cutwater C-28 weights in at 10,400 pounds with normal cruising gear and mostly empty tanks.
The twin Yamaha F150 outboards (approx 520 pounds each) on newer RT-27OB are really not significantly lighter than the VP D-4 (1,060 pound) diesel in our C-28.
The 8,200 pounds dry weight for the R-27OB that you might see referenced is a joke. I’m not surprised if your R-27OB with fuel, water and normal cruising gear came in at close to 11,000 pounds!