3 weeks after repotting isn't really long enough to expect a change. What is your lighter medium made of? Can you take a good picture of it?

it is potting mix, with perlite, and little tiny red stones.

Start fertilizing with a good fertilizer, weak solution, and 1 capful of vinegar in a gallon of water every time you water and it will improve as mine always do)

thanks! the root lookes ok, but not spreaded at all.. not developped as i expect from 4 years old tree..

meyermike, what do you recommend as good fertilizer?

i never heard of vinegar in the water, what does it do?

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Vinegar lowers the pH.