Just to go back to the big one..the main issue with the roughness is the fact a staple of arrow coasters is the fixed radius curve. They loved them and all their coasters used / use them extensively.
You can re profile a single piece of track but it is still sitting within the fixed radius of whatever section of the ride / transition it is in, so it's not really going to do anything to improve the smoothness because the fixed radius curves on the big one are all made up of many, track pieces.
Taziker are not to blame for this, it is a fundamental design flaw of the ride. The only way to really solve it would be to re design the whole layout to use transition curves that adjust in tighness based on the average speed to coaster should be going at a specific part of the ride, so that the body doesn't get yanked through curves as is the case now. I can see why it may feel worse now though as the 're profiling' (if you can even call it that) does nothing what so ever to help the fundamental flaw these arrows have.
This is the single number one reason why arrows are so rough. I don't think there has been a single arrow in history that has not used this type of curve extensively. Whereas not a single B&M, Mack or Intamin to name a few, have a single fixed radius curve, on any coaster they have ever built, on the main circuit (outside the station and break run area).
Taziker have no chance of solving this as they are not re tracking the whole thing in one go.