Follow-up post
Got Zero-X as an early birthday present (43 on the 31st), and have been doing the drills for about 10 days.
The first drill can be mind-numbing, but it was important. I didn't do the full 2000 reps he recommends, but went past 1,000. I was to the point where I could close my eyes at the stroke and make it. Then I started putting left and right English on the ball and still couldn't miss. I noticed I'd stayed down and followed through on every shot, and decided to move on to the shotmaking drills.
The short of it is that there is a structured practice guide that I have found easy to follow and much better than what I was doing. Lowry tells you how to set-up targets and measure success, and in the drills, doesn't have you doing so many of the same exercise that you get bored.
The weakest part of my game has been the lack of pre-shot routine and consistent stroke, leading to missed shots when my concentration wanders. This already seems to be helping that. Really recommend this one.