My microwave use hack isn't turntable or cup position related. It's that I round to the least number of unique buttons to press and still get near the needed cook time. For example, 33 sec for half a minute, not 30 sec. 99s for a minute and a half. Over the years I must have saved nearly as much time as it's taken me to make this post.
I do this _and_ the handle synchronization thing (with some angle tolerance to get the single button time). This discussion is making me feel a bit OCD.
