read laz's threads he explains all
Believe it or not, I have a life to lead as well, and cannot sit in front of my computer all day answering questions (particularly when it's always the same questions being asked and answered).
SAM did not scale down your marks. It only looks like it did.
Look at this flowchart:
http://www.boredofstudies.org/other/flowchart.pdf
Raw marks are both 'aligned' by the Board of Studies and 'scaled' by the Technical Committee on Scaling.
You don't have your raw marks, so SAM can't scale them - instead, it tries to work out an equivalence between your aligned marks (the ones you got given today) and your scaled marks (the ones that have been calculated for use tomorrow).
Just because your scaled mark is lower than your aligned mark doesn't mean you've been scaled down - because it might still be higher than your raw mark. Nearly all scaled marks will be lower than the corresponding aligned mark. This is explained in the "You and Your UAI" booklet that all HSC students recently received.