Jorge,
This is what I have:
meters reads shoot at
1 1
2 3
3 5
4 8
5 11
6 15
7 20
8 25
10 35
12 45
15 60
30 2m40s
45 7m
60 10m
2m 15m
These work very well. There is some thought that you don't need to change the development with the Ilford products like you do the Kodak stuff. I think I might do that to about 20%. After that I would not fool with it if it were me.

lee\c