I'm a little late to this party but it sounds like the ball is reacting to turns properly. The F-14 only has adverse yaw at high AoA, as mentioned, and under those conditions the ball moves in the direction of roll. At low AoA it's actually proverse, in which case the ball moves opposite the turn.
Roll spoilers were actually designed to prevent adverse yaw in the first place but I guess, like anything, they have their limits. Could be they overcompensate at low AoA so that the sweet spot where they work properly is in a more usable range for a fighter plane, as opposed to an airliner that's never going to see that kind of AoA.