FCS, you haven't lived! How about a max weight 747-100 with low powered engines, Nairobi, 5,300' elevation, 10,000'+ runway, +30 deg. You want low acceleration! You got it! Full power, end of runway coming up, 55 seconds to lift off, over the end of the concrete at 50' every time. Then juggle flap retraction or climb, but you can't have both. Sometimes neither happens! Your little 737 at 82% still goes up like a space shuttle compared to that