Thats fine. It conflicts with advice given about the species from others (bearing in mind different climates etc, its been taken in to account), so its just a difference of experience and/or opinion.
The rhizotonic stuff said it was for developing roots, not fixing any particular problems but I'm happy to try any way.
It is in need of repotting next spring, that much I know. It will have been 3 years, its done well. Ill buy that stuff now and try, Id heard about it a while ago from Harry Harryington, but again, more for collected trees needing to develop roots, whereas this is in a different situation but happy to go off your recommendation
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I have a mix I have settled on now, which is not what it is in. My mix is a mix of slightly larger particle size, a small particle size and small percentage of pine bark. So it will go in that next spring. I dont tend to do akadama, don't want to get on that train, as there may be no getting off it!