Thanks for chipping in, Mick! As Phil points out, however, my idea is to make base without a mix powder (or the spices that would constitute a mix powder). I am also considering to omit the tomato puree after reading Phil's comments in another thread (sorry for paraphrasing you wrongly on that one, Phil!)
I still have quite a lot of my current batch, since we don't eat curry so often as we used to (the wheighing scale does not seem to appreciate it. :p ).
Might make a parallel batch (although my wife won't like it, She thinks our two freezers are already too full! :-) ) At least that would allow me to make instant comparisons. I will keep you all posted (but it might take some weeks).