Ok so the tree got flushed out , watered more frequently with rainwater only and I kept on with the fungicide. The tree is still deteriorating and all new growth still black and everything turning crispy still.
Couldn't help but think root problems , so I've took from pot and I think the roots were rotting in the terrible soil . Also no new roots since I potted the tree in may , it just looks like more have rotted than have grew. Anyway Fast forward a bit and now ive cleared the soil away from rootball , repotted in my maple soil mix in a nursery pot . Its Very late in the season and probably a death sentence to be fair but the way it was going it was a slow death anyway. So we shall see how this one goes .
As a side note the same soil has almost killed off one of my other acers in the same way, (black growth , crispy leaves , struggling tree) .....
Do not use miracle grow bonsai mix it suffocates roots !