I 100% agree. I had hesitation problems after my J-Spec was put in. I asked the mechanic to put in NGK Platinums at .32 gap, and he said he did. Well when i finally took a look, my suspiscions were confirmed... they were Bosch plugs at .042!!!
With Magnecor 8.5 wires and NGKs @ .030 later, hesitation problem fixed!