Both those motors are rated at 1.68A. It's usual to run stepper motors at a peak current between 60% and 85% of rated current. Above about 85% they get too hot. So for those motors, that's about 1A to 1.4A. That 1.4A is a little high for TMC2208 drivers, but possible with good cooling. Should be no problem if your drivers are TMC2209.
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