Mutt, you should read a little more about engine performances
Have a look at the thrust chart for your B757, tell me at what temperature does the thrust start to decrease? ISA or ISA+15C?
indeedy, Mutt is on the money, my 757 charts show the engines (rb211s) flat rated until isa (or isa +3 - can't remember - haven't got any performance charts to hand - but certainly not ISA +15)
TOGA if runway is contaminated or required for performance... TOGA take -offs in lightweight big jets are reasonably exciting!
oooh yeah baby - hold onto the tail and enjoy the wild ride.
Windshear reported is a case were we use TOGA - took a 757 with about 10 pax and 10 tons of fuel the other day (70 tons with 39 tons of thrust), - the VSI only goes up to 6000fpm and it was pegged - for quite some time.