A few tips that work for me
A) Downhaul sail fully. (Until battens are just pulled off mast without outhaul) Then outhaul to limit.
B) Use smallest fin you have got.
C) Move harness lines back to absolute limit.
D) Boom shoulder height.
E) Mast track to front. (This is contentious;most folk go to back with smaller sails but forward helps keep nose down and help bear away )
F) Straps well inboard and forward (aids control)
G) When sailing dont rush into it. Go upwind to slow down. If really overpowered dont try to gybe. Drop in and water tack.
You didn`t mention weight but I weigh 103k and in 35 knots would be on at most 4.5 and on 95 litres.
We all get overpowered;its part of the learning porocesss. If wind is building I often drop down 2 sail sizes.
If its building just wait a bit !