I have tried several tunes and the best is my Lund tune.
That TSB is not really a "statement" of the engine living on the ragged edge. Basically there have been reported failures of pistons that have been due to aftermarket tuning. This new processor and twin VCT should be left in the hands of the pro's such as STEEDA, JDM and others that have knowledge of software and hardware, Joe Blow's dyno shop isn't going to cut it. If they where on the edge then FRPP would not have a 624HP supercharger kit.
Talked to Ford today re: Ford Racing tune and it will void your warranty. Ford seems to be serious about calibrations changes.There is of course one alternative. Use a Ford Racing Performance Parts tune instead. Ford can't void your warranty if you use their own products.