Ya know I think that's exactly what's going on. I noticed what appeared to be an uneven amount in one corner and tried to correct it with sealant. After I retorked everything it seemed to help so hopefully it's air tight now.
So do you have the numbers on how much the heads were shaved and how much the block was decked? Just trying to use those to help you make a judgement on how much you ought to worry about this.