It's ESS. Their tunes are often praised. There are thousands of 330s using the same kit, same tune.
I tried couple of different tunes (from ESS), currently on a special one for really crappy gas.
Lowered boost, pulled timing, ran 94octane, added octane booster.
The only time the car ran right was when I used unleaded 104 race gas.
The plugs are probably the cheapest way I could try to solve it. Then there is meth/water and thicker headgaskets. None of that should be needed for this reliable off the shelf kit.