Mcspeed

Sounds like you are barking up the right tree, between possibly being rootbound and clay it seems the water is running out around the soil and out the bottom.

Although it should be done before leaf out I think I would look at an as easy of a repot you can, loosening the old soil so the water can get into the root ball. You need to be carefull though, with new soil the water can still avoid the clayed in rootball, hence loosen the clay ball, also the opposite water can run thru making you think it's draining well but keeping the clay (where the roots are) wet.

Did this this get fairly dried out as in maybe missed a watering, often as some soils dry out it can be very difficult to rewet them without soaking the whole rootball and soil(ie mallsai instruction for watering).

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