There are two issues here: first, how well the reel and the fixed blade fit each other, if perfectly aligned; and second, how well you align them. The first is a sharpening issue, and the second is an adjustment issue. You can't fix faults in one by doing additional work on the other.
In my limited experience the biggest problem in most cases is amateur adjustments that damage the blade or cylinder. Once that happens it doesn't matter how well you adjust it, the parts no longer fit each other. Hence I suggest after professional sharpening you should never run the reel under power until you have achieved a perfect result turning it by hand. A perfect result means there is almost no force required to rotate the reel, and no sound except a sort of very slight hiss as the reel blades pass the fixed blade. When you put a sheet of paper between reel and fixed blade, it should cut smoothly right across the width of the reel, and sound like using a pair of scissors to cut paper (only a bit smoother - most scissors are not very well made).
