This may seem off-topic, and I am far from an expert on the draw (although I am improving), but what I keep in the back of my mind is the following video:
Essentially, for those that don't want to watch the video, this engineer built a backwards bicycle (if you turn the handlebars left, the bike goes right, and vice versa). He tried to ride it everyday for 8 months, without success. Then one day, he could just do it. There was no obvious gradual improvement over the 8 months, but apparently everyday while he was trying to ride it his brain was rewiring itself until (after 8 months) it had made all the right connections. Of course, then he couldn't ride a normal bike and it took him a while until he could ride either bike interchangeably. I keep this in mind while I work on my shooting -- even if I am not seeing obvious improvement, my brain is getting rewired and one day it will all come together.
Just my $ 0.02