So the new set of plugs arrived, so switched out them along with new wires, since two broke during work (Magneti Marelli) and since I already tested and bought a new coil pack basically the whole ignition system's now revamped.
So far after more than two hours of driving, no problems, but Im really careful since I dont wan to find out Im wrong, but it feels ok.
The old plugs where NGK, and after pulling them, their resistance measured on average about 4 kohms.
I kept the previous set, which where Beru's and they measured ~1.4 kohms.
The new set is Bosch, and Im going to stay away from NGKs since I drive a little bit sporty, lasted less than two years, and (I think) 20'000 km.