I just flew a 4+ hour flight (about 1700nm) in the 737-200, so I started with full tanks. Although the initial climb to 10000 feet was done at about 4000 fpm, using full power, by the time I reached FL310, I was struggling to maintain 1000 fpm with an airspeed of about 240 KIAS or less. That was using the settings I mentioned above (regarding the inlet_area = 9.6 and the static_thrust = 17400). I wouldn't call it overpowered any more. Certainly not like it is when using inlet_area = 19.6 and the static_thrust = 25000. So I'm pretty happy with the performance now. It may not be exactly right, but it isn't too bad.