you may want to prune the top a little. kinda like with bonsai, since the roots are so dismal.

How can you have too much soil?

Too wet, yes. Too much?

All of that turface and perlite you added will cause it to retain even more water, I think that you are amplifying your problem here. It will need even less water.

too much potting mix and it doesn't allow the moisture to evaporate as quickly, and also if the tree doesn't have a large root system the moisture isn't absorbed as quickly either, both conditions creates excessively wet potting mix.