$33 - 6h Turbo Questions

[DMMx69]

Im somewhat new to playing SNGs. I have a pretty sound strategy (at least i think) and have been tracking my results to determine what level of play is most profitable for me. One thing I have noticed at every level though, is my %age of first place finishes is much higher than 2nd place.
Example: 850 games, 22.4% 1st, 15.3% 2nd. (ITM = 37.6%)
this makes for an ROI around 11%.

How do these numbers compare? I feel that I should be ITM more often, and wonder if I am being too aggressive with 3 and 4 people left, and thus when i make the money, have a lot of chips, but am often not making it at all?

Thanks for any suggestions.

dmm