So, like in CA's recipes he adds a laddle at a time, should I leave it cooking on very high heat for quite some time in between adding the laddles of base?
Absolutely, Phil, that's what you should do. The whole process (and especially if using precooked meat) should take around 7 minutes (i.e. if you want BIR, rather than traditional, style). I definitely wouldn't want to cook precooked chicken for too long...it will become very dry, and tough, I think.
If you are cooking large volumes, you need to ensure that your pan is big enough and that your heat source is strong/powerful/hot enough. Otherwise, you will "stew", rather than "fry", the ingredients. Adding liquids (e.g. curry base), a little at a time, on high heat, and evaporating the water content, is a good way to go.
You also need to ensure that you don't add too much of any other liquid (e.g. coconut milk). Some ingredients will thicken the sauce (e.g. lentils, gram flour, coconut milk powder/flour, etc), but some will thin it (e.g. cream, milk, coconut milk, water, etc). So, substituting one for another will influence the consistency of your sauce.
So. my "rule of thumb" (for BIR cooking at least) is high temp, short time.