IMO the only way no rear flares look good is if you are running a full skin and no longer have the stock part showing where they would mount.
Here's mine as it sits now, kinda hard to see but I have the fender well and pinch seem painted black.
Pitbull rockers.
Here his mine with the ace fender delete kit. View attachment 155260
How much did you have to trim the rear pinch seam?