I'd just run the 10w-30 Dominator by itself. It has a TBN of 8.0, so it will hold up fine. Another option would be the Z-Rod, 10w-30, which is another thick 30 weight (HT/HS of 3.6 Cp), also formulated for HiPo engines. There's a virgin analysis of it posted over on BITOG.
As a rule I'm against mixing oils; I just don't see the point.