solarsplace,
yes - i've added in the josh and chewytikka suggestions: more chilli powder, green chilli, less puree (not convinced), add whole cumin, black pepper.
as for rogan josh and dopiaza - dishes i live very much but i can't cook either so parked for the mo.
i now think the answer is in a green chilli paste and going to work on this for a while 1st. i know ashoka make just plain green chilli paste but if a few additions make it a sticking plaster for me then why not.
ps not tried the Taz base - i need oil at dish frying and too much oil in total is no good on taste.