Microburst
If I had my books and my scanner, I would post here the L/D curve, and a graph of an airplane gliding angle.
finally, two airplanes of same model flying at maximum glide speed (min drag speed or max L/D speed) will glide the same, irrespective of the weight. Only the heavier will fly faster.
This what you want?
At anything above 230 kts on this aircraft the Lift/Drag ratio will be better at the higher weight and the aircraft will take longer to slow down;below that speed the opposite is true.