Can't comment on your barrel specifications; however, it's been my general experience with Glocks that problems like this will occur until you have a good 300 (or more) rounds through a new pistol. The Wolff rod and spring should help. Personally, I think you should stay with a standard 17# recoil spring until the pistol has been, 'verified' and begins to run smoothly.
http://www.gunsprings.com/index.cfm?...ID=1&mID=5#109
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