Try thinking less about the time or number of repetitions you put into learning a tricky passage, but experiment with being more reflective with this 3-phase self-regulation model.

Before playing a passage: Plan!
What do I want it to sound like? What technical strategies will I utilize? i.e. Lift up more with left hand, release with thumb, etc.

While playing: Self-monitor!
Am I lifting up with my left hand, releasing thumb?

After playing: Reflect and strategize!
Was I successful? i.e. Was the shift in tune? If not, why not? What adjustments do I need to make technically, to get it in tune the next time?