Ok, end of competition. I only manage about 14% return. The highest return point was 30%. Highest ranking achieved was around 600.
My failure to get better result is due to wrong position sizing. I have 250k to play, but I was trading just like my actual account size. At the beginning I was using only 30% of the capital to play, that was just at the time HK CWs were starting to move up. This 30% generated most of the profit. By the time I realize my position sizing problem, it was quite late for me to play catch up anymore. When I try to use the correct sizing, it was almost at the end of the bullishness.
Honestly, I didn't really understand the concept of position sizing until I play this game. So I learn something!