Confidence threshold
Define a personal threshold: execute only routes you can explain in one sentence.
If explanation fails, route is not stable yet.
This threshold is not about being slow. It is about knowing the difference between a verified route and a hopeful guess. A verified route sounds like: 'Move green left to block column 7, then push red down to row 10, then push red right to the target.' A hopeful guess sounds like: 'If I move green somewhere around there, red can probably reach it.' The first is executable under pressure; the second collapses when the timer hits 10 seconds.
Calibrate your threshold with data. After 20 rounds, check your success rate on routes you could explain versus routes you could not. Most players find a dramatic gap: 90%+ success on explained routes, under 50% on unexplained ones. That gap is your motivation to slow down just enough to verify before executing.