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I do believe the inconsistant and somewhat lower marks with the 100-400. I've used it with my 1DMKII for over a year now, and when its on its great, but If the light is the least bit inconsistant, the results are disappointing at best.
Its usaully good with static objects, but with that lousy light, even those sometimes are inconsistant. Its with BIF that the problems usually arise, and I've shot with all sorts of different settings including AI servo as well as single shot at shutter speeds usually around 1/1600 - 1/2000.
Yes I have seen some great shots with this lens even with BIF, but it seems much better suited to perfect light and or airshows and car races, which it excels at.
This is just my lens and camera combo, and it also could be the extremely colder conditions were having too having certain results.
This Tamron lens really seems to be great, and at a great price as well.