Unfortunately, out of the box what you are experiencing is normal for most standard shadow 2's. I think the main difference between the orange vs standard blue is the bushing, fitting, and trigger set up(not pull weight). I could be wrong about the trigger pull weight. The standard mainspring that interacts with the hammer is pretty heavy on the double action. Many shooters like myself will change the mainspring. For a long while I changed it to a 13 main spring which sets off all primers I have encountered. It brought it to a tolerable double action. I started a thread on it if you want to read more about it.
Back to your concern.. short answer: it's normal. If you want to have lighter, you will need to change mainspring weight. inexpensive and very easy to do.