Can you clarify this for us? I am going to assume that your pistons are 0.030" OS, which would dictate that the cylinders are bored 0.025" over, and then honed to size (0.030") for the pistons. If you are not using any power adders, the resultant bore should be 0.030" because the pistons are smaller by the clearance required for a NA application. If you have power adders, you usually increase by a thou or two, and gap the rings to suit your usage also.
If, in fact, the bore were bored & honed to 0.035", and the pistons had lets say 0.0035" clearance built in, you would actually have 0.0085" clearance roughly. If any was added for any power adders, the clearance would be even larger, and might explain why the cylinder cracked; it was getting the **** beat out of it with the larger clearance.