You certainly did the right thing by not going anywhere till you were happy.
Remember these are old tech instruments and are often more than 5% inaccurate (135rpm at 2700rpm). Car speedos were thought acceptable at 10% error.
The aircraft flight manual will normally give a max static rpm which on a fixed pitch pro is always less than red line max rpm. The test is normally conducted crosswind to reduce the effects of the wind.
Warriors should pull between 2330 and 2430. In reality they normally pull 2200-2400 depending on the instrument. We test the accuracy with a strobe tester through the props if we have any suspect problems.
CS props should obviously reach max rpm static.