Jerry,
Don't get me wrong, the CK CTM is great. I've tried (in seriousness) probably about 50 CTM recipes and this is the best one I've found. Everyone I cook it for loves it. Here in Canada, no one knows what it is, but my CTM has become famous within the extended family. BIR converts in Canada - who would have guessed it! Some have even graduated to appreciating the Madras and Vindaloo!
In terms of what is missing, that is very difficult, as CTM is different wherever you go. Right now, I use the CK recipe as stated with the following change - carnation milk instead of cream. I tried the red masala (per Pete's recipe) in lieu of the tandoori masala, and I could not discern any improvement. To give an idea of comparison, my Madras/Vindaloo is now as good as I've ever had in a BIR. No further work necessary, although always open to try a good post on cr0. My CTM is probably in the top 20th percentile. No better than that. Korma is in the same boat for me.
As you suggested, the base may be the issue. I actually tried another base in the archive (forget the name off hand) that was "ideal for CTM". It had a separate tomato frying/melting stage, and the end result was a nice tomatoey base. I didn't recall the end result being markedly better than the Saffron, so I discontinued having two bases in my freezer.
What is it about the Rajver base that you think would improve the result on a CTM? Very curious. Also very interested in what SnS could dig up from the Saffron in terms of a dedicated CTM/Korma base. I was going to try that base (since I'm down to my last bag of Saffron) but I think someone was going to post an update to it ?
Maybe the secret for you is the tandoori masala you use. I think the ones I get here are crap.
BTW - I use the Blade Tikka recipe (no yoghurt - not BIR) and while the Tikka is fantastic, I'm wondering if the lack of "yoghurt residue" is partly to blame.
Sorry for the rant!
-- Josh