I mean there really cant be an argument here. I love pistols and most of my characters bar one mad wookie are pistol fighters. A pistol in no setting other than when it comes to concealment or weight will never outmatch a rifle, it is simply a smaller and less powerful version of the same. If you want to be a combat focused character with pistols you need to use two to make up for their inherent weaknesses compared to rifles. Now if you want to be combat focused and not two weapon fight do something else fun with your second hand like sue a grapple gun to zip around the battle or maybe use a shield. To try an house rule it so that a dude with a single pistol can be comparable to a dude with a rifle is just silly.
Now while i love the idea of your Deadeye talent it is broken AF. My guns currently have accurate 2 and im looking at my third rank of quick strike, take into account aiming and im throwing about 5/6 blue dice on my opening salvo. add in your class and you have that each shot and a stupidly high amount on first salvos. You would need to write in something at the very least that states you cant take this and Gunslinger but then again you will be dissappointed because those extra two blue dice will never out damage the second pistol.