$Direxion Daily FTSE China Bull 3X Shares ETF (YINN.US)$ thi...

$Direxion Daily FTSE China Bull 3X Shares ETF(YINN.US)$ this is supposed to track 3x $iShares China Large-Cap ETF(FXI.US)$ but it drops more than 3x and jumps less than 3x, which is not good but expected. Instead I can short 3x itm put of FXI. I don't have to worry about the time decay. Anyone tried this before?