Used to get noise violations at LHR, (B747-400), procedure became Lnav, Vnav, Auto Pilot at 400', violations stopped, manual tracking never as accurate as the auto-pilot! (The usual 'aces' will disagree
). Reduced thrust or full thrust? Depends on aircraft/airfield etc. sometimes full thrust will get you up, up and away reducing your noise signature, what is the company SOP?