I think your method looks good; I've worked a similar template in the past. Generally speaking, though, my method for the last couple years has been to work from the bottom up: putting every slider at zero and increasing them as I see plays that are unrealistic. In fact, my 2004 sliders were
very low across the board (think: a combination of zero's, two's and five's) and drew rave reviews. Lower slider sets haven't worked as well the past two years, but I still believe it's a great way to go about finding a good set.
If you don't already get the idea, it breaks down like this:
1. Set everything to zero.
2. Play as 'seriously' as you can.
3. Look for flaws.
4. Wait to see said flaw a second time.
5. Upon the second occurence, bump the offending slider
one notch.
6. Repeat steps 3-5 until the end of the game.
7. Start new game with sliders as they were at finish of last game.
8. Repeat steps 6-7 until every play is yielding a realistic result.
This process lasts for roughly 4-6 (exhibition) games; by then the sliders should be solid enough to give them a run in Dynasty mode. I'll play one season of Dynasty, continuing the above process. By the end of the season, the sliders should be pretty much set. Play another full season (tweaks by this point will be few and far between) and by the end of the year (you've played some thirty games by now) the sliders should be perfect.
Restart Dynasty; your sliders are awesome and you're awesome at the game.
(That's how it
should go down, anyway. Truth be told, I never achieved a set of sliders for '06 that I was 100% comfortable with, so you never know. But, in theory, this process should be flawless for anyone willing to put in the time.)