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That's kind of lean for full throttle, but it's not "lean" stoicheometrically (sp?). If it richens up later, you know it's not your injectors running out or your fuel pressure being too low...
The red line is a guide, meaning at full throttle you'd like to be about 12:1 or 11.5:1 on a safe tune, but as I understand it it's pretty common for stock ECUs to run a little less fuel there, and I wouldn't worry too much as long as it richens up as you get closer to redline.
An air/fuel controller would allow you to make adjustments, yes, but unless you're going for more mods I wouldn't worry too much about it.
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