Intensity For Weightlifting Technique Work

Tadeáš Asks: What would you say is the optimal range (% wise) to practice technique in? Say you have a lifter with decently developed technical skill (good squat/snatch ratio etc) and no specific issues who struggles with consistency at higher percentages. In this case, we are usually told to practice technique more, but how much should the load be lowered for the training to still be productive in this regard?
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