Flying in wave conditions with 50kts of wind, I got "low" and the computer indacated a marginal glid home. I dug out until I had 3000 ft over glide (MC 2). Considering the was more than a slight chance of wave sink on the way home, I thought I should crank up my MC as one might do on a thermal flight to insure you are looking at info with some increased margin. Rather than lower my arrival, it increased it to 5000 ft. A fence post case to be sure, but the point for this thread is, you can try fiddling with your MC when flying in wind to see if you can see a difference in arrival height. I had never seen it "reverse" like this in thermal conditions (might happen between 0 and something low) but you can try.

I have always used the rule of thumb for glide into the wind, but in 50kts you can run out of fingers to count on...