My take is you'll be competitive, and good for you for seeking out suggestions on how to better your chances. I wish I could have had a GPA close to that. As a guy who scored poorly on the AFOQT in college I would suggest getting good study material to improve your scores. The book I used was pretty common back in '91 and helped tremendously; pulled 50's up to 90's...that and actually being a B-52 nav helped a bit as well.
Any input you can get from a guard guy I would treat as gold. Seek them out if you can...maybe baseops.net might have guys over there who don't frequent APC as much.