Mine have the same numbers and they're in the right spot on the model.
Are you sure you've still got the default aircraft.cfg?
I kinda remember there have been several updates for the DC-3 (including one that was approved for the RTW Race a few years back) that juggled the CoG and ref_datum position. I never really had an issue with the default Gooney bird so I never made any changes to mine.
Here are my datum and CoG entries from the weight n balance section. This is from my "clean" testing install. No mods at all.
max_gross_weight = 26200 // (pounds)
empty_weight = 16145 // (pounds)
reference_datum_position = 19.25, 0, 0 // (feet) distance from FlightSim Reference position: (1/4 chord, centerline, waterline)
empty_weight_CG_position = -20.90, 0, 0 // (feet) longitudinal, lateral, vertical distance from specified datum
The damage threshold for the stock tailwheel point is 1200fpm where the main gear is 1600fpm.
Tailwheel is contact point 0. Check the 4th entry.
Mains are 1 & 2