If the barrel does not put the ball on top of the blade while looking straight down the top flat, changing the sight or bending the barrel is necessary - for us. That is how we sight our 'trade' guns or folwers for ball shooting.
Your face must have an anchor to be in a repeatable position for good shooting (as good as it gets with a smoothie), ie: your cheek or jaw bone hard onto the comb for a proper postion, otherwise you have both an elevation and windage problem. Most times you can modify the front sight position, soldering it slightly to one side or the other to correct minor windage problems, or adjust it's height for elevation problems.
If your face has to be off the comb, or have you looking higher over the barrel as inshooting shot and the front sight cannot correct this, the barrel needs to be bent upwards slightly- without kinking it, of course.
Not for the "weak of constitution'' casual shooter.