Reducing DAO trigger pull?

[cyberfish2]

I'm interested in the SCCY CPX-2 9mm, but it is DAO, with a 9lb. trigger pull.
Is this 9 pound pull primarily a function of compressing the firing pin spring, or can it be reduced by managing some other factors?
I have worked on another gun (Sig Mosquito .22, don't ask) polishing the sear engagement areas, hammer, trigger, and trigger bar(which was rubbing on the slide. I machined .020" off the top of it before buffing it).
After several tries, I got rid of the grittiness in the trigger, and got the SA pull down to an acceptable 5#, from 10#, but the DA only dropped slightly to 12#.

Are there ways to manage trigger pull on a DAO gun?

[Bt Doctur]

SA is just releasing the sear, DA is compressing the hammer spring .
You could install a lighter/shorter spring for testing

[cyberfish2]

whoops

SA is just releasing the sear, DA is compressing the hammer spring .
You could install a lighter/shorter spring for testing

I meant hammer spring, not firing pin spring. I had a hard time finding ANY parts for the Sig Mosquito. Wolff springs didn't have any alternate choices.
I don't have the SCCY; I live in anti-gun Calif, where they are not on the approved roster, but I may be able to get my son, who lives in Nevada, to gift me one for Christmas.

[6mmintl]

Smoothing/polishing wear/contact surfaces always helps but as you experienced does not reduce pull weight enough.

Mi ght try cutting coils but on a defensive pistol you may have to bet your life on may not be advisable. You will have to test various ammo to get reliable ignition and stick with that brand.

Try moly disulfide on high pressure point parts.

[B&D]

Weight of spring and where the trigger bar engages and rotates the hammer come into play. You should be able to get a 8# DOA reliably out of it. Any lighter and you'll get light strikes.