Harmonics is something one should worry about if repeatable accuracy is an issue. I find seeking a Harmonics weight to be a last resort. Other simple issues will affect Harmonics like:
-Loose stock (most common)
-Loose barrel or shroud
-Anything else Loose on gun
-Chrono that hangs from barrel
-Moderator (get one gun likes better)
Free floating barrels can have an issue. Sometimes a barrel band can solve issues. I've seen guns that come with a barrel band shoot better without.
There are solutions you can buy if you really need to go that route. FX makes an adjustable weight. Terminader Industries makes a few things. Donny FL makes a Moderator that can be shortened or lengthened as well as removing baffles to lighten.
Don't drive yourself crazy. If your gun is shooting the way you like, run with that. If not, check it over and see what you can find.
Happy shooting!