I too shoot the 155 A-max over Varget and found 45.0gr to be my happy spot running and average of 2840fps out of my Savage 12FV with a 26" barrel. I am getting no pressure signs at all and great brass life and terrific accuracy.
I have seen many different min-max recommendations for Varget and 150-155gr bullets. I would venture to guess that bullet construction has a fair amount to do with it, also bearing surface, and a variety of other factors, but yes it has struck me as strange as well.
I would say that you found your lower node with your 42.5gr load and would keep working up if you desire more velocity. if you are happy with that load then I would go ahead and keep that charge and start playing with your OAL.
Good luck and Good shooting.
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