Yeah Alnico Creams are tricky. I like them quite a bit with some amps and in certain situations, but they can be a little spitty and harsh if not careful. If you compare the graph to that of a V30, the Alnico Cream has more in that 4k-5k region. I don't think graphs always tell the whole story; however, IME the Alnico Creams do seem prone to get a bit harsh in that frequency range.
When micing one on axis with a 57, I almost always point it to catch less of the dustcap than I would on a V30. At least that's what I do with high gain amps. Sometime I'll even point it just outside of the dustcap altogether, so that the 57 is pointing directly on the cone with the side of the 57 lining up with the point where the cone and dustcap meet. Then I back it up a little to get the tone to open back up.