For the "long" 737 like the 800, 900 (and even the 300 maybe) the flare is sensitive and that's not easy to decrease the sink rate below 200/150 ft per minute (that should give you a standard load) with flaps at 40, but quite easy if you keep some thrust til touch down.
exactly, and with the coded FP, the 2.8 GPA is becoming the standard...