Well I think I know what the problem is. I bought these as blemished with the understanding that they would just have mild finish blemishes. However the finish looks fine, but they are not straight.
Some of them you can even slip a dime under when you role them on the table. I called GT and the tech said that the blems can either be for finish or straightness. He said that I must have got a batch that was culled for being out of spec not for finish but for straightness.
I guess this could be my problem with erratic flight and grouping?
Thanks
Dave