If the track is anything like it was last year, then you need to be thinking about what tyres to run. I don't know what would be good for the RC18, but the mini-pins seemed to be the tyre of choice last year for the cars able to run 1/10th sized wheels (so that'd be the 1/16th class this year, I think the yellows we're the best).
I'm sure others will gave you their 2 cents worth too
