Let me agree and disagree. No, it doesn't need to be "tinkered with" a whole bunch, it is great out of the box. But the DA is sill pretty heavy and for about $30 you can make it 5.5 to 6lb.
I'd get an extended firing pin, 12lb Hammer spring, and 2075 firing pin spring (reduced power) from CZC and put those in there.