Player Projection Methodology

I am nearly finished all of the WAVE pitching projections, and will begin posting them in the near future. After, quite literally, hundreds of hours being spent plugging numbers into equations in Excel spreadsheets, it has come to my attention that my methods may in fact need tweaking, as opposed to the formulas themselves. I have been plugging the data in to my formulas, and leaving the end results as they are, regardless of how silly they may seem (see Matt Diaz, NL Batting Champion). Is this the best way to project a players stats, or should there be manual tweaking at the end of the process? Please participate in the poll entitled 'What Is The Best Way To Project Player Performance?', located to the right in the sidebar, and let me know what you think.