I'm not sure what those open places are for? Are you trying for clouds and spots?
When I cay the blade ( over the dried wash coat) it is a smooth and even layer about .05" thick, with the edge of the clay forming the rough hamon line. From there I add ashi lines and other effects. I clay right up to the spine, covering it in most cases.
I quench in oil. Parks #50 for the fast quench steels, and a blend similar to AAA for other carbon steels.