I don't really know, but whenever I'm accelerating or standing up going uphill it makes quite a bit of noise.
Is your shell straight (coaxial threads, faces orthogonal to the axis)?
This is what I assume is the problem - I think it might just be slightly out and stressing the bb (but I have no knowledge of this kind of thing). Is there a hacky way or measuring this?
There's barely a non-hacky way. It's not something anybody ever measures, they just chase and face and assume (usually more or less correctly) that the tool deflection will be less than the desired tolerances.
I don't really know, but whenever I'm accelerating or standing up going uphill it makes quite a bit of noise.
This is what I assume is the problem - I think it might just be slightly out and stressing the bb (but I have no knowledge of this kind of thing). Is there a hacky way or measuring this?