Alright mate, if you want to be as quick as those Aliens in your Cup/Championship. You most learn the 40:60 theory.
Well this Theory is a basic theory that all pro's in the Rotax Max Challange know.
To begin with, you will need 4 EXACLY the same scales to calculate the weigth of your kart and you with in it. Those weigths will be places under each wheel.
Now once all your 4 wheels are the the center of each scale start to write how much the kart weigth is on each scale. Then take your racing stuff on you, the helmet and other things and seat on the cheer. So your dad writes how much weigth each scale has. (RIMEMBER to not have the extrla weigths on the cheer because you will place them after you make the calculations)
Now you most calculate how meny % of the weigth is on the front part of the car and how much is on the rear part of the car. Then you will have to add the extra weigth's to get 40% of the TOTAL weigth of the kart on the front part of the kart and 60% on the rear part of the kart.
You most also have 50% of the total weigth in the left and right side of the kart too so make sure you do that because once you are done, your grip will improve and your braking will be most better wich means you can carry more speed into the corners.
You should go on google and look about that but I am sure that both David and Fredrik knows about this (if they dont then they are bigger noobs then I thought).
Now to the lovely track.
What layout are you using because it's very hard to tell with thils meny layouts. Btw I realy recommend to make as less lap as possible at the first practice because the sand (if that is sand on the picture) will eat your tyres preaty badly but if you have practice tyres and race tyres then use the practice tyres and dont care about the tyre wear that much.