Lee,
Of all the FS cadets I trained last year, and there were about twenty of them, you are the one I reckon has the best chance of making FJ pilot.
Remember that OASC is looking at the overall picture: weaknesses in certain areas can be balanced with strengths elsewhere. Current Affairs knowledge isn't the be-all and end-all, but you will be expected to have thought about it before interview.
Push for pilot; as has been mentioned, have the courage of your convictions and tell them you're not interested in other branches, but be diplomatic about it. On my OASC board interview I had to explain to a Wing Commander Nav why I didn't want to be a navigator! Worked out in the end, though.
Having flown with you for 3 weeks I reckon you have a lot going for you, not least a considerable amount of piloting ability and self-confidence. Relax at OASC, try not to be overbearing in the Part II phase and you'll be OK.
Good Luck
ST.