Ramen,
Glad I don't have to fly in the mountains with you. I have found this sweet spot many times when a young and inexperienced sprog pilot. Luckily I never hit anything solid before I worked it out. The sweet spot in these conditions WILL find you, but maybe only 1 in 100. As JD says it is difficult to find the exact spot but when you do it will be pretty clear. As I pointed out 800-1100 FPM is only 8-11 Knots. Hence the methods used in the mountains are to avoid exactly this condition. Go ask a Llama pilot what makes his sphincter twitch.