On a broader note, has anyone tried using the dry-fry mix powder technique on their usual mix powder rather than Syed's and using that to make what was your previous best (non Syed) curry? If that doesn't make your previous best curry noticeably better then it would suggest the dry-fry method is a red herring.
Or indeed a non dry-fried Syed mix powder could be tried in one of his curries and compared to the same curry with the dry-fry Mix powder.
I have a feeling that any differences that may be noticeable when using the dry-fried Syed mix powder will be down to the actual contents of it, rather than the dry-fry, lacking curry powder as an ingredient as it does compared to nearly all other mix powders.