CJ, I once experienced a similar thing in a SK-76. I was tasked as a favour by the RAF to pick up some British Army soldiers from a rocky offshore outcrop in the South China Sea (obviously, there's a bit of a story behind why they were there and why the RAF couldn't do it themselves), in the teeth of an incoming typhoon. The headwind on the way out and on arrival was somewhere over 70 kts, even at low level. The only place to pick the pax up was from an into wind, steeply sloping rock platform. The slope caused a strong updraught and every time I tried to fully lower the lever, the aircraft autorotated well above the surface and the Nr kept rapidly going to the top limit (doesn't take much with the 76's slippery blades). It took quite a few attempts to get even one wheel on the ground. Thankfully, the soldiers were very keen to leave their precarious perch as they were almost being blown off into the sea and beginning to get rather wet. As soon as the one wheel touched, they leapt on the aircraft like rats up a drainpipe. On our way back to base the indicated ground speed showed 223 kts.