Anytime you put a external bearing on a bike that has never had them, you should probably face the frame to make sure it has a good flat smooth surface. I just put some new LX cranks with external bearings on my Trek 7300 and it needed to be face.
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Brian | 2023 Trek Domane SLR 7 AXS | 2023 Trek CheckPoint SL 7 AXS | 2016 Trek Emonda ALR | 2022 Trek FX Sport 5
you should learn to embrace change, and mock it's failings every step of the way.