Well for starters i think your colour transitions should be way smaller, i know u get a big amount of paint on your model by doing this but if u keep ur layers thin and watered down correctly, this shouldnt be a problem.
I do recommend that u use a white undercoat, in my experience the white works better with thin layers.
Here are some pics of my Bonesinger.
As u can see i started with a very dark colour for the base of the cloak, i had to put in 2 thin coats of it to cover completely, after that i very gradually built up the colour to a red gore/blood red mix (with a very small amount of blood red) while i started with a 85/15 black/scab red undercoat, so the trick is to get a big amount of thin layers to build up your colour very smoothly.
I did the same trick with the sword by the way, only the end colour is sunburst yellow so thats even more coats
Hope it helps.