Phil
I tried something along the lines of your recipe this evening and it was relatively flavourless. I did so many things differently, though, that it's not fair to condemn your recipe itself. For a start, I used my own base sauce and I didn't have any rabbit stock to hand.
My pre-cooked chicken was grilled thighs. Perhaps these leeched more chicken juices into the sauce than your breast meat. I find that chicken juices are a curry-killer, rather than a benefit.
I'll try again, adding more spices to taste, to see if I can improve the flavour.
Not only does this recipe involve no frying of the spices. It doesn't include any onions or ginger/garlic puree in the final stage of cooking.