http://insidepitch.buffalonews.com/2015/08/28/minor-tweaks-yield-big-results-for-dalton-pompey/
This is more or less what I read/heard. Here's some notable quotes as well:
“I pretty much have my approach and what I’m trying to do,” Pompey said. “From what I’m trying to do in the cage and in BP and then when I step into the batter’s box, I have a plan now. I feel good. I mean it could be better in every aspect but obviously I can’t complain with where I’m at. Not even just from a numbers standpoint, just from how I feel and how I’m seeing the ball and the way my at-bats are going.”
“The first two months I was kinda all over the place. I wasn’t feeling good at all. My hands weren’t where they needed to be,” Pompey said. “It was minor tweaks, you know, but they made a huge difference. Obviously I’m reaping the benefits now but it took two months to figure it out.
“And the goal is now that I’ve got it figured out is to keep it going. If I ever feel out of whack, what did I do to pull myself out of it this year? That’s kinda the thing that I learned and what I need to do to be successful and I just have to remember that. I wrote it down so I can look back on it.”
Also it was Stubby Clap, the AA hitting coach, who I heard on the Jeff Blair show discussing Dalton's new approach and mechanical changes.