At 53 strong conditions just don't do it for me anymore

I'll take a warm day and 8-12 knots sub planning conditions over any 25-35 knot day.
A few days ago with my 4.4 m Koncept I had the worst day of sailing ever.
Massively overpowered then a few seconds later the same but underpowered - and freezing too.
A 100 litre and a 6.2 is about as small as I think I'll go from now on.
Much above 25 knots - I'll stick to staying safe.