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Hi Piet,
I agree with Simone regarding the advice and points he has mentioned.
One thing also to keep in mind is the following. Try to reconstruct/recreate the plants away from the Crown Head. This entails locating the Crown Head where all your previous pruning wounds are. Here there will also be a large amount of desiccation and dieback internally which negatively affects the plant.
I hope this gives you a little more insight?