Ok, thanks a bunch. I guess the bottomline is, in our environments where an unrestricted climb is inlikely (LFPO and LFPG are fairly similar in that regard), thrust doesn't increase until about FL100. Since my work here is focused on the initial part of the climb, I'll just recommend that washout occurs above FL100 as a basic rule, and that should work in a fairly realistic way.
Thank you all for your input!
Cheers
--
Romain