FRQ, I actually think its the other way - 65, 75, 85,
from the top, down.
Reason being, if your GW is up around the 85 tonne mark, you're not going to be as high to start with, so your driftdown will be quicker - the bottom line only allows for short driftdowns.
I dont know. I never use that page.
For a good laugh at the quality of the book, though, have a look at page 2 - 6 and see if you can find anything there that perhaps is out of place...