I bought a Beeman R7 recently, and have been breaking it in. The JSB Exact RS Diabolo 7.33 grain pellet does the best, but others work out well. Question: Is it worth the money and effort to replace the original spring, or go with a tune using the Vortek Pro-Guide 4 Tuning Kit? And is that the best, or maybe the ARH Maccari kit? I am going for max smooth, not a harder-hitting gun.