Thank you all for some useful suggestions.
I have discovered 3 things.
1. The centre of the cart was not centre of the tonearm shell mounting bracket, slightly off centre towards centre of the platter. Hope you understand.
2. Mass, since the wood body was on the heavy and bulky side I shaved some material off.
3. Noticed that the cart glued with the wrong angle in the wood body. Front a bit lower towards the platter then it should. Raised the tonearm as a temporary solution until I can redo the wood body.
All in all the sound is going in the right direction. Since I'm short on time I did all 3 at the same time
Shaved some material of, more oval and curved body now, roughly half the weight.
Wrong angle, notice by the increasing gap in front over the stylus.