I noticed that the spring is now part of the circuit path in the Precise and P+ models. I was wondering if having the spring plated in copper, gold, or rhodium would make a noticeable improvement in performance? Altsmoke sells a low resistance "Hotspring" upgrade for the Silver Bullet, which appears to be copper or brass plated. reviews from the site mentioned a noticeable difference, especially at 3.7V. I was considering buying an extra spring for my P+ and having it plated. Waste of money?