ok at 20k climb rate really falls off.......250 feet per minute, if I read the chart correctly.
I was at 16k climbout with less than 50% fuel and 8 500 pnd bombs and barely passing 200 feet per minute, and not doing much better back at 13k. Really slow climbout with no flaps and no WEP. I will check my stats again this evening but if the chart above is from previously generated stats in AH, then something is off. I should be doing around 700 feet per minute. Thats a deficit of 500 feet, or about 70% off the chart.