Hi HS,
In the meantime, I have tried quite a few different bases (from others - such as Chewy's, Ray's, Taz's, Undercover Curry, etc). I have also tried quite a few iterations of my own base recipe posted on the forum (e.g. adding garam masala, whole spices, frying the spices beforehand, using whole onions, adding chicken carcasses, etc). The one thing I haven't explored fully enough, though, is using spiced oil in the base. I really must crack on and do this.
I am currently using my seventh (or more) iteration, since posting the one on the forum, but the current one is not dramatically different from the one I posted (e.g. it has a higher percentage of onions, more garlic, more oil, some whole spices, etc).
Other than that, I'm currently "going back to basics" with a much simpler spice mix and curry base (primarily for milder curries such as korma, tikka masala, etc).
Otherwise, yes, I still use my own spice mix (I've also tried quite a few others) and my own base recipe when making my curries. So far, to me, most decent curry base recipes on this forum are much of a muchness (and, for me, still don't quite hack it - BIR wise).