Mutt is right - he always is!
My nice new 319s with CFMs have a Tmax flex of ISA+60 which can give a TO N1 of around 78% which magically slides up to a Clb Thr of about 85% at Acc Alt.
All this changed about 4 years ago and my copy of Grips is older than that. Has it been updated?
Cheers
mcdhu