If you could keep the top end over 13:1, you'll have more top-end horsepower to show for it. 11.5:1 is pig rich for an N/A engine, and you can see your torque curve take a dive at 4.9k, right where you start to go rich. I would expect a stock car to put out around 105lb-ft and 116hp to the wheels, so considering your torque numbers and your air/fuel curve, there are a few more (~5-7 peak) ponies waiting to be tuned out of that engine.

What is your current setup?

Whenever you are unsure about your injectors, have them professionally cleaned. It is best to know how they are performing before you try to tune against and air/fuel printout.