I'll give this a go, and also do some experiments with comparisons to other "Balti" sauces and adjustments.
CT's comment re Ground whole spices = bad idea. Probably even more so considering there are 3 cinnamon sticks in that small amount of gravy. Is it just me or is that a lot of cinnamon? 3 X (I'm assuming 4" sticks ) seems like a lot of cinnamon to me for a gravy to serve 4 people.