If it ain't broke don't fix it. I'd guess that most of Wolff's business is in selling replacement for perfectly good springs.
Stock springs are good for from 2000 to 6000 plus rounds, although some competition shooters may change them every 1000 rounds. Wolff recommends replacement at 3000 to 5000 rounds. Springs do not get weaker with just age or from being kept compressed, just from cycling, and I doubt very much that your pistol was ever used that much.
If it starts throwing cases too far get a new stock weight spring. I'm not sure how far the typical TT throws brass, but someone should have an idea. 1911 types generally toss empties 3 to 6 feet, depending on the load and spring weight, and if beyond 8 feet the spring is too light or worn out.
I swear by Jupiter Optimus Maximus .... in the army of the consul Lucius Quinctius Cincinnatus and for 10 miles around it I will not steal anything worth more than a sestertius in any one day.