The DC3 is actually quite easy to fly but you have to learn how to.
That means learn MP/RPM combinations that get you the airspeeds you need for the different phases of flight. Then only adjust those in small increments as needed.
The best way to do that is by flying straight and level and then establish the numbers by reducing throttle by 1” and if necessary rpm by 100rpm and then let airspeed stabilize.
Once you have these basic numbers established the plane is really just a big heavy peach.