I must say I agree with what has been said so far. I can't see the sim counting about 70% of your success weight.
I know of guys who have made some terrible mistakes (like forgetting gear, exceeding flap limit speeds, banking more than 45 degrees to intercept an ILS), yet they got hired.
Maybe the secret is how you perform in general, and your overall attitude (personality wise) towards the sim, the assessors etc. All in all, I think your success is mainly determined by your personality - they either like you or they don't! I mean, If we like a person, we will forgive some of his mistakes, but if they don't like you, well then your mistakes become their justifying argument.
Goodluck for those awaiting their sim rides!