Very little ground effect on the deck, as it spills overboard. Ashore, this effect reduced the actual touchdown RoD whilst you were holding constant attitude and AOA.
The 136kts mentioned is IAS of course, but the ship is trying to produce 30kts of wind across the deck. A combination of ship speed and natural wind. Thus speed over the round-down was a little over 100kts.
In light wind, or calm conditions, the ship could hunt for wind with exciting changes of course for the poor sod on a CCA. ( The centre line suddenly moving off to one side or the other)
All good clean fun of course.