Jetting chnages depending on air pressure, temp and humidity. No one day, sometimes hour, will need the same jetting for the max. Have a read of http://www.karting1.co.uk/jetting-karting.htm Also, do some searches of this forum. Just stick in Rotax and have a look through and read a few threads. This is what I did when I started out and found loads of helpful tips.
Considering how cold warden was yesterday, 12-83 seems a tad low. It depends on how heavy you are and your engine but I'd say try 12-85 for now as it'll give you a boost out of corners. I've been running 12-85 and found it better for lap times than 12-84, which was recommended to me.
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