You should try to avoid adding a ballast restriction (weight) unless it is mandatory, also intake restriction. What was it you were exactly trying to achieve? Didn't get much information from the OP.
Final race of the season, so i expect it to be a tough race. Have a feeling that some of the teams i didnt see as competitors will be challenging for the podium. Hope it will be clean!
Edit: Some thoughs on the layout - After SC1 on the long straight with the right hander, on the grass as you enter the corner there are 2 barriers parallel with each other, i see this as maybe too dangerous so could it possibly be replaced with some 4x4 tire stacks made by yourself. Secondly the last chicane, IMO there is too much going on there with 3 poles on each corner, you have left no room for error at all. Seems like if you go slightly wide or turn in a little early you will hit the poles and could easily cause your car to lose balanced and effectively spin or even flip.