Congratulations on the improvements -and the great results. Very often, rifles with sporter weight barrels do better NOT free-floated. Certainly, the better stock, glass bedding the action and conversion to a blind magazine played a role. The barrel dampener, I would bet, played a big role - but would not have without the other items having been looked after first.
In any case, your success with your rifle is proof that a carefully tuned standard rifle, with the fundamentals looked after properly, can be made to do the same job for which custom rifle makers charge big $$.
Again, congratulations. Well done, sir.