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Ive read that the 3mm adjusters loosen up pretty quickly, so not been using them, just the barrel adjuster to bring the pads closer to the rotor. This might mean the arm is already too far away from the 'testing position'? Assuming testing position is when the arm is fully released, if that makes sense
Turkish-
They do loosen up too readily unfortunately but they are the best way to adjust it. The Spyre seemingly has a similar ramp mechanism as the bb7 so using the barrel adjuster can affect the power of the brake.
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That's the correct way to set up both Spyre and BB7.
And yes, the arm should be at the resting (pretty sure M_V has fat fingers and he didnt meant testing) position, maybe just a slight teeny bit of tension to take out the slack on the cable but it should never be pre-loaded too much i.e. resting position is at 5 o'clock, tension set at 4.
As the pistons are moved via the actuating arms, ramps and bearings, loading it means that the bearings are already on the ramps before the brakes are applied.
M_V
coventry_eagle
Sorry I'm a bit late with this, I found using the 3mm Allen key adjusters on each pad to bring them as close as possible to the rotor improved things.
Check the arm is fully returning to the testing position too.