When it comes to cassia though, I don't think it is minor. Too much and it can have quite a detrimental effect. In terms of taste and balance, I was very pleased with the Kushi base.
Extracting the right amount of flavour is crucial to the overall balance as you know. One thing that I have learnt recently, is to tear Asian Bay before cooking with it. This was spurred by the comments on Natterjak's recent post on it. I reserached this on the net and found reference to this. It has quite an effect, try it and then smell the leaf.
This brings me back to ways of extracting the right amount of flavour from the Cassia or even cinnamon for that matter. The IG boil the hard spices in water seperately from the base. Not only does it make it easier to extract the hard spice but makes it easier to control the amount of flavour put into the base, as you simply control how much infused water to put in.
Of course they have this down to an art and it would be far better for us to have exacting measurements. The trial and errors continue.