I can't compare the KD1 base as I do no have the book. KD2 does say new and improved base recipe but when I read it, I thought it sounded a little bland to be honest. But in the course of experiment and to do justice to the listed recipes in the KD2, I will be trying it.
The Keema dish is a delicate one, that is for sure. You don't need alot of spicing to change it's overall balance. In my opinion the Garam Masala improved the dish at the end. What did annoy me was the lack of measure in the Cauliflower needed for the dish. I mean, what is 1 small Cauliflower. If you go to the supermarket, a small cauliflower can be anything from 4-7 inches. As I cooked the dish just for me, I used about about half a pudding bowl of the chopped cauliflower and quartered the remaining ingredients as much as possible.
Changes I would make include adding finely chopped onion a little more chilli and as an alternative, maybe some spinach too.