Had similar problems with Sora brakes on my better 1/3's bike.
Tried 105 calipers, improved a bit. Tried SwissStop pads, improved a bit. Tried new outers, improved a bit.
In the end, switching to 105 levers sorted it.
Thank you for sharing this! I am hoping that I won't have to upgrade any bigger parts for some time to come, but will definitely keep this in mind.
@pjhobs started
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Had similar problems with Sora brakes on my better 1/3's bike.
Tried 105 calipers, improved a bit.
Tried SwissStop pads, improved a bit.
Tried new outers, improved a bit.
In the end, switching to 105 levers sorted it.