I am running those in my car now and they are perfect!!
Personally I prefer NGK and have had excellent results on our customer's cars with NGK. They make a great plug.
On almost all FSI / TSI applications we prefer the NGK, either PFR7S (which is the 'oem' plug on most TSI engines we see) or PFR7Q gapped to .028. We have had bad luck with missfires with the Bosch on tuned cars. Stock seems fine.
I honestly can't say if you're low/high or I was low. What I can say is on my 9A 2.0 16v (rough guesstimate 185k miles)... NGK iridium plugs (standard gap)
I was having some stuttering/mis-firing at high boost on the spark plugs so I switched to the NGK BKR7E with a .028 gap. Right away I noticed a huge improvement but I can't help but feel it could be better.
From my own experiences the raceplugs seem to help with misfire happy maps.
Been using the ngk ones for 10K km so far and they work just like oem, no problems, no misfires.
The racing plugs from NGK are exceptionally expensive, their standard Iridium plug is great as well. I wouldn't spend the money on the racing plug... I've tracked my car with the standard Iridium plug extensively and had no issues with plug wear etc. I personally feel that the racing plug is just taking more money out of your pocket for no gain/return.
Not sure what exactly your setup is/how well you have tuned for it, but on BKR7EIX plugs @ .028 and 25psi, I was encountering some spark blowout. Basically felt like the car dropped 2 cylinders, and my exhaust had muffled misfire sounds that basically sounded like a very fast skipping CD of fart noises lol.
I have the one sided electrode NGKs and it screwd up my mileage. but it seemed to happen once I switched the spark plugs.
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