Hi haldi and ronnoc.
The thoughts that crossed my mind were:
1. I don't think there should be any garlic added to a korma
2. Being a cream based curry it shouldn't be cooked at high heat like say a madras.
3. If this base is dark then the only way to make a white/yellow Korma like a BIR is to have a large cream to base ratio.
When I think Korma, I think lightly spiced puddle of cream (which is why I don't really like em), but I reckon if you think that way you're more likely to get a BIR style finish.
What do you think?