Unfortunatly I'm using the trial with no save so I can't save this file.

And I finally I solved my issue, the bulge was visible because of bad curve construction.

If I can add a question, is it possible to have a jiggle parameters for the array to add some imperfection in the placement of the objects?

And an other thing I didn't find, how do you project your curve on one side only? Currently it project through the whole object and you end up with two curve, the same things happen with the boolean diff, the hole is occuring through the entire object and I would like to have a control on the depth of the cut.
Thanks