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This is a really useful question! I was an over presser for years. Figuring this out is set me on the path for corrective measures. I invented my own drills to fix this issue. It involves seeing how lightly I can press the string to make the sound I want to hear. I found there is a minuscule amount of pressure between clear notes and muted notes. Once there I mess around with the varying degrees of muting vs. clear ringing out tone. There is a proviso here: the harder the tips of your finger are the less energy it takes to make a clear sound. Finger tip texture matters. There is only one way I know to get those tips rock like, many many many hours in the saddle. When you think you have callouses, keep going they get tougher. When I get the tension out of mind and arm/hand/fingers my precision and accuracy improve. Controlling speed is key here. Slow enough to play without tension and getting the sound you desire. Final analysis: play more, develop finger texture; target tension as the governor for speed.