Hi im having a hard time finding a trustworthy recipe for bonsai mix in new Zealand.

I have river sand ,perlite ,zeolite ,pumice decorative pebbles (daltons), Daltons premium potting mix and garden loam.
 What would be a good ratio blend for deciduous trees and natives , I would realty appreciate your input.

Next to pot up are a a Hazel, a Corokia and  a Buxus.

I just repot my 60 year old Chinese juniper in :

10% garden loam
20% Daltons premium potting mix
10% peat moss
15% perlite
15% zeolite
30% sand  ,     (  60% drainage ,40% organic matter) too much organic?)

its seeming to start greening up. This was my first bonsai  repot and I put it off year after year due to unfounded apprehension and no available mix. .So, after 7 years in the same container it went kinda yellowish and had a lot of brown dead foliage to remove but looks like its not stressing ;a week later . 
 
Now i'm a little worried it might not drain fast enough. After a week drying out i put 1 3/4 litres of water on it.It takes thirty seconds to drain the flooded surface after each application. Surely that'l be ok .?