I finally did it and it paid off : As you can see in the picture (sorry for the poor resolution) I cut the resin part at the basis of the strap, on one side.
Comfort and look depend on the size and shape of your wrist : mine is such that my Gshock always turns around the wrist to the outside : in that case I had to cut the resin part on the inside side.
In case you don't see it well in the picture, I'm talking about the part of the strap located at the junction of the strap and the bezel, whose purpose is to create a wide angle.
Well personnally I don't need that wide angle and it is even too wide, so I took off the strap of the inside side, cut off this part, and put the strap back (with a screwdriver)
Feeling better now lol, and it looks also more suited on my wrist.