Personally, I believe it's a little pointless to gauge whether one aspect of your application makes you competitive or not. For instance, I got suckered into taking the ASTB out of the blue without really knowing even what it was and got a 68 8/7/7. I applied SNA BDCP then OCS with 4-5 different applications/requests for reconsideration over the span of 3-4 years before I even got my Navy OCS SNA pro rec. My GPA floated anwhere between 3.1 and 3.4 at a Big 10 school (recruiters have always told me this matters /shrug) in Aero engineering and mechanics.
Long story short, from what I've seen my ASTB was far passed competitive, my GPA was rather solid, but I kept getting rejected. No doubt about it, the boards go absolutely nuts for the 'whole person concept'. I didn't get selected until I beefed up my app with a LOR from an O-6 (I don't think the effect of mid to high ranking officer LORs can be overstated, just don't say that to a marine OSO) and a misdemeanor theft violation on my record became more than 7 years old.
My advice: participate in enjoyable extra-curriculars, volunteer crap, and shmooze around with officers so they know you well enough to write you an LOR. Don't sweat the academics if they're at least solid. Oh yeah, and have the determination/drive to keep going through the whole process until you're age-disqualified, makes for a good motivational statement.
