just for completeness...
So where's the link to a chart with a type III+ on it, or do you just move one more line down the same chart?
I'm sure you guys already know this, but for the sake of those who stumble across this thread:
start with the chart
modify for skier type:
I- go up one row
I stay there
II down one
III down two
III+ down three
age under 10 or over 50 - go up one row
[That means that an internationally recognized standard says that I will be officially "old" two months from now.]
There are also some details on how to use the chart, for example what to do about blank boxes (move sideways) or if height and weight disagree (use whichever gives the higher row (lower setting)).
For exact wording see alpinedad's link, or use search to find the link I got the Rossi manual from.
There is also a page about what to do if the skier wants a setting different from what the calculation comes out to. ("Information for Skiers Requesting Discretionary Settings") It doesn't say the technician shouldn't do it -- though that may still leave shop policy or insurance company regulations to get around.