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You got it right by being 1 - 1.5 stops under ambient, flash is on ETTL. When there is ghosting, I try and play with the ISO to avoid that effect. I always shoot ss@250 no matter what the ISO is. In this stadium, I should've shot at ISO 640 instead of 800 to avoid the ghosting. I just shot these few flashed shots and dialed in 800 out of habit as it is what I start with. I never go over ISO 1000 when using flash except when using HSS.
I shot these at ISO 5000 with HSS because I knew that I would get good results with the Mark4 but not with my other 1D bodies.
From a game I shot about 4 weeks ago with ISO 5000, HSS, SS@1000, flash on ETTL.