Hi for me we always tend to over complicate a Real BIR Madras sauce, but when it comes from a TA it is light on spice and subtle of flavours and deep on heat.
IMO 60% of a madras is in the base sauce and if this is over spiced then it's never going to happen.
Also the initial frying of the spice is Imo the main culprit for people turning a curry bitter, along with the gravy being way to thick to reduce itself properly.
I am able replicate my TA Madras no problem with 1 spoon oil, half a teaspoon of mix powder and half a teaspoon of ground fenugreek leaf + 1 teaspoon Kashmiri chilli pow + pinch of salt + half teaspoon of tom pur?e, little tamarind and a slice of lemon.
That's all it takes along with a very lightly spiced base gravy and the correct cooking and reducing.
