I have a bit of an interesting perspective in that I'm trained as a professional cellist and have worked in opera and symphony orchestras extensively. There's a certain amount of reflexive ability on the cello that's developed over the years. On the piano, however, I've taken very few formal lessons since childhood, and so I have a much more acute sense of what I don't know, and shortcomings in my technique.
Since I have limited time for piano practice - mostly for physical reasons (!),
I try to apply the cello practice techniques I've developed over the years for use on the piano. These involve frequent deliberate distortions of rhythms - for instance, if I have a long passage of even eighth notes, I will vary the way I practice using dotted rhythms to show up any shortcomings, i.e. long/short, short/long.
I'll also play a short passage backwards and forwards, play it in a different octave than what I'm used to. If it's a series of chords, I'll roll them very slowly from the bottom up one after the other, and then from the top down one after the other.
These kinds of activities are adapted from cello exercises by Janos Starker, who himself adapted them from a method by the violinist Sevcik.
In short, it represents the idea of designing brief exercises around the specific musical passages that are giving you trouble.