Use PT4 or HEM2 to analyze your play by each position. Try to find out how many bb/100 you are making from different positions and start there. I've played a lot of 180s over the years. Today's games are still good because people are making tons of mistakes. In general, most people under-defend their big blind, play too tight overall, don't know push/fold spots well and make ICM mistakes. There are programs out there that can help you analyze all in decisions for all stages of the sng, so I'd recommend using them.
If you have any specific questions, I'll try and answer them.