Pentalab you sound very knowledgeable about this, as for my car it's the same as yours 3.31 gear and auto. So what gear would you recommend ?
In my case, I have a small roush M90 blower, instant boost, instant TQ hit. Then added the FRPP twin 62mm TB, JBA ceramic coated LT's, 94 octane tune. On the dyno it was 386.3 rwhp and 370 rwtq. Before all the mods, it was just 252 rwhp / 260 rwtq. I left the oem 3.31 rear gear alone. But I did install the DSS-DS aluminum DS, and also the Eaton-detroit tru-trac LSD, along with the whiteline watts link..and a ton of other suspension mods.
The 3.31 is ample for my use. Burns the tires off in 1st gear, and throws me into the back seat in 2nd. Pulls like a mofo in 3rd. That's with MPSS rears in 305-35-19 on 10" wide rims. ( 285-40-18's on 10" wide front rims). 0-60 mph comes very quickly, 4 secs. 0-100 mph in 10 secs. Like how fast do you want to go ?
Also replaced the oem upper grille with a 7 bar grille. The oem upper grille on the 10-11-12 cars restricts 80% of the airflow. With the 7 bar upper grille, it also eliminated the 2 x 90 deg bends into the..'snorkel' that feeds the oem airbox. ( filter replaced with a higher flow K+N). Boost goes up a bit when on the hwy. On a 2010, the oem airbox flows a lot more than the 05-09 cars. It also flow more than the 11+ cars. I can start at a red light on the hwy, with car manually shifted into 3rd gear...mash gas, shriek of rubber, off we go, to 90 mph...all in 3rd gear. I need 1st gear like I need a hole in the head.
The beauty of the LT's is.... they work in NA mode, or blower mode. I can put my foot into it, with boost gauge sitting at 0, or slightly less, and it pulls hard.
For your NA application, use a 4.10 gear. That would be the fastest, 'easiest' way to make the car accelerate quicker. I'm assuming you may or may not be able to install LT's (which are not cheap).
What is ur height above sea level in AZ ? Toss in hot temps in summer time, and bolt on's may only add a certain amount of hp/tq. The 4.10 gear will definitely work.
10 years ago, I almost went to a ton of bolt on's, cam's, rear gear, etc, then decided to leave it all oem, and bought the small blower, cheap, for $5K. Only lost one street race..to a twin turbo AMG vehicle.