I was successful a few months ago, so I know how you feel!!!
I wouldn't worry too much about the negatives on your OASC report. mine was full of criticism. If you hadn't met at least the minimum standards required, then they would have already asked you kindly to F&*K off.
I know guys who were on my UAS who were weakly recommended, and they are now on IOT. Even if you don't get in, you could always reapply - and probably nail it next time round.
How did you do on your aptitudes?
Good luck!