I just bought a new G34 and am having trouble with failures to feed and stove piping with the load I use in my other 9mm Glocks. The load is a 125gr bullet over 4.6 grains of Winchester 231. It works perfectly in my G17 and G19 but suspect it may be too light for the extra weight of the G34's slide. Should I consider using a lighter guide rod/recoil spring so I can continue to use this load? If so, which one? I bought the G34 primarily for use in IDPA matches, so I would appreciate any information regarding effective loads for this purpose too.