When there was sudden wind direction change I was still at oposite bank of Shearwater on my 8.0 RAM and 130L. Without even gibing going still up the wind my sailboard did complete 180 degree turn. Wind did change from North to South in matter of seconds. Then possibly the hell broke loose.
Thankfully I could back on well overpowered sail ( 8.0 > 30 knt ??) and then change to smaller gear.
5.7 was still a bit too much for 35 ktn gust but manageable

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I think that is still relative 5.7 could be perfect on flat water at 35 knotts - ie Sandy Point to similar but on Shearwater due to the big chop you are simply unable to release full power.
4.2 -4.5 could be possibly the best for then part of the day but I left athome...