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BSN101 said..
25cm fin is tiny!
I run a 38cm in my EQ2
starboard a Phantom Race comes with a 52cm.
Going up to 34+ should give a performance increase.
Mast track more forward when sailing up wind with centre board down and back going off the wind with CB up. Experiment too.
You have to be able to reach the straps and sill sail comfortably so boom a bit higher or mast further back. You will need to experiment to find the correct boom height and mast track position and wind strength.
Now what sail are you using...
have fun
Sorry but this is Really bad advice, these boards have a us box with absolutely no reinforcement just box glued to plastic, your fin is around the size they came with anything bigger than 30 will pull the box out.
Owned one in the 80's for a few years and learned the basics, not big enough volume (from memory about 170 litres) to compete with modern race boards , just enjoy it as is.