FRP Actual is the actual fuel rail pressure on the high pressure side. Are you monitoring AFR on the gauge cluster in the car or the Accessport? The gauge cluster in the car reads in AFR (SP) or AFR (Stoich Point). That shows the AFR based on the stoich point setting of the fuel you are using. If you want standard AFR, like on a wideband O2 sensor kit (that's calibrated for E0 gas), then you'll want to monitor AFR only. 9.73 would be about right for the stock calibration because it will dump fuel in to prevent knock and decrease combustion temps, especially with the junk stock intercooler.
As [MENTION=13694]Juben[/MENTION] has eluded to the Access Port allows you to continuously monitor up to 6 different parameters at a time. You can datalog a lot of additional parameters that can be reviewed via excel spreadsheet or other programs such as datazap.
It sounds like you appreciate the low end grunt of the stock tune on good premium fuel. I would imagine with the auto trans, you never need to rev it out past normal shift points, therefore it probably does feel more fluid that way.
Here's a list of parameters to log to determine if your tune is on point. It is recommended to perform a 3rd gear pull from about 2500rpm to 6500rpm. Turn traction control off and just do a pull in 3rd gear until you reach 6500. If you want to send me that log file, I can put it on VD just as a reference for you.
Throttle response to me has never felt different. What you likely are feeling is the difference in timing curve between tunes. The stock tune is more set for your daily driving experiences. most poeple live in the low to mid rpm range, so your boost and timing will be in there to keep the car moving. Cobb's 93 tune basically is the same as stock but with a lot more of a punch, but it falls off at around 4200-4500rpm. My Tune+ tune the timing is brought it much more linearly and I honestly feel I have a much fatter power band. Granted I also drive in sport mode and keep my rpm's up even when daily driving as I just can't stand how the transmissions is programed from the factory in normal drive mode.
No drone at all. Just as quiet as stock when cruising. When getting on the throttle with the windows open you hear more exhaust but it's just noticeable with the windows closed.
Seriously, check out these Full Boar Max Flow SS mufflers. Select the 2.25" to fit up with the factory Ecoboost exhaust or 2.5" for the factory GT exhaust. You literally cannot beat these mufflers for the quality, price, and sound. These are just as good, if not better because of the price, as Magnaflows. I'm surprised more people don't know about them and/or use them. Get them and you won't be disappointed.