I apologize for my harsh words, come down with flu and put me in a narky mood.
Anyhow you have answered your clutch slip issues Luca, too much torque and power running through a stock clutch which can't cope over time, it is effectively reducing the life span of the clutch when you remap
So the problem is the remap, not fog grilles etc, unless you wish to upgrade your clutch to one which can cope with a remap