No, just water less. I think the layer of orchid mix is holding in too much moisture. Before you water, stick your finger down into the soil, below the orchid bark, to check for moisture. Did you put gravel or pot shards at the bottom of the pot?
All trees grown from a seed start life by putting down a taproot. But, as the fibrous roots develop and spread out, most trees abondon their tap root. Avocado trees have wide, less than 2 ft (but probably less than a foot deep) fibrous root system. If it ever had a taproot, it is gone in a mature tree.
Cutting or restricting a taproot is no big deal for an avocado. Disturbing the roots is a major deal. Their roots are super-sensitive.