If something is "scratchy", you may want to polish it.
With 4 and 1/2 lb trigger pull I wouldn't recommend doing anything and as gc70 posted, just give the handgun some time.

If you want to make it smooth - take it apart, polish all moving action parts and you will see the difference.
The only disadvantage, in your case, is that you may end up with even lighter trigger pull, which is not a good thing for this firearm.

You can try simple trick to smoothen the action. Make about 500 dry fire repetitions - rack the slide, press the trigger and keep it, rack the slide, reset the trigger and press it back than release. (repeat)