I agree that the ABC Balti cookbook is a good one. If I made the base again I would reduce the amount of mace and probably the cassia as well. My piece of mace had swelled up to the size of an elephant's ear by the time it was finished.
And of course you can't remove these flavours once done. I got a good result by following the chicken balti recipe but substituted two thirds of the base amount with Chewytikka's base and it nicely toned down the overbearing mace flavour.
Cheers,
Paul