That'll work, but you also might want to measure the gap on the right and left each side of the rear and front sight in the dovetail and determine if the left measurement is smaller than the right or vice versa. From the pic (I know what you mean about it being tought to tell) it doesn't look off to me and if it is...it isn't by much. Try takin some measurements and see what you can determine.Maybe an optical allusion.
take a straight piece of anything that fit in the rear sight and line it up with your front site, measure from each side of your slide.
Also the slide casting may have been off center a little bit.
I am pleased that you got your sight issue squared away and there was no problem with them being off-center to the left. Excellent shooting BTW.A little of this subject:
I was having problems with rounds feeding and I determined that to be an ammo issue. My gun doesn't like Magtech ammo.