Hello HR
I don't think it's the frying of the fresh chilli and chilli powder that's giving you that effect, I think it's more likely to be down to the asafoetida and methi leaf. Next time include the chilli as before but add it last after you've added the base. I'd be willing to bet - but not too much - that you will get the same flavour as by your original method.
And asafoetida giving a sweet effect, that's a new one on me! Asafoetida is often used as a replacement for onion and garlic and usually gives a, umm, onion and garlic savoury flavour.
By the way, while I'm on the subject of asafoetida, don't buy Vandevi brand. It comes in a small yellow pot and is almost totally flour and turmeric, with just a hint of asafoetida and you don't get the full effect of the asa as a result. Good brands are Bart spices and Natco.
YF