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.
'Wisdom To One Is Foolishness To Another; But, Alas, A Fool Knows Not The Difference; And, The Road To Hell? ...... It Remains Well Trod By Those Who Should Know Better.'