SR9C Windage

The first time to the range with this new gun, I was grouping down and to the right.
I've got the elevation dialed in now on the rear sight.
I drifted the rear sight as well and now, after two additional trips to the range, the rear sight has been drifted all the way to the left edge, but I am still ending up to the right, although not nearly as far now. (About 2-3" at 25')
I haven't worked with pistols before, but did take private lessons before my range trips, so my question is, what are the odds this is me vs. it being time to send the gun back to Ruger for adjustment?
The fact that my previous rear sight adjustments brought me up and left, leads me to believe it could very well be the gun.

Might want to drift the front sight to the right somewhat!

Funny that you mention that. I just finished looking at the front sight closely and it is indeed off-center to the left. Now just trying to decide if I try it myself or take it to the gunsmith......