I think that sounds VERY reasonable Ben. But I don't think it needs to be that heavy either. Just regular weight and CLEAN so it hit's the drag limit at a higher terminal velocity.

There was a video on the web a while back of Joe Wurts DS'ing. The speed was quite scary looking and I can see that it would take a lot of concentration to just breath on the sticks at just the right times to best work this stuff. There was also a vid of someone with a discus launched HLG DS'ing with wind coming over a line of wind break trees in a park so it doens't take a lot of difference I'd say if the model is up to taking advantage of it.

It doesn't have to be a geographical setup either. One of my most memorable model flying days was on a stormy and blustery day at the thermal field. I had a 2 meter aileron bird and put it up just as the guys were packing it in due to the weather. I played the model back and forth across the wind and whenever a gust picked up the windward wing I'd turn hard into the wind. The gust energy would pick the model up anywhere from 10 to 50 feet during these "tacks". I'd crab across the wind in the opposite direction and do it again. All in all I was in the air for about 20 minutes at altitudes ranging from 10 to 80 feet and it was up and down about 40 or 50 times between those extremes. Finally the pattern broke down long enough to put me on the ground. It was a very intense and gratifying 20 minutes that I'll never forget.