There is/should be a spring tension adjuster on the calliper, a 2mm Allen key grub screw on the arm opposite the cable clamp, from memory. On older models you could remove the spring and open it up to increase tension (I’ve also done the opposite to decrease tension for women riders with smaller/weaker hands) but you can’t do this on the 9100 model.
Ah yes, there is a screw there but it’s just for centering.
I just found the manual online and it says ‘arch spring adjustment cannot be carried out for Br-R9100’.
It’s not ‘really’ weak and I can’t imagine the spring is defective.
It’s just noticeably weaker than my 9000 calipers...
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