Since this is half and half I would think it would be a simple math problem. One half is 1.1028 and the other is 1.0000 so you take the difference (.1028) and divide that by 2 (.0514) and you end up with 1.0514 which should be really close.
On deck - AAA x2, Irish red
Primary - Baltic porter, IIPA, Mild, ESB, Milk stout, Scottish 80
Secondary - American Barleywine
Bottled - Gingerbread ale, IPA, Brown porter, RIS, Better than dead x2, APA x2, Kolsch