If the line opened at Tulsa -4 and moved to Tulsa -5.5, how do you figure there was 90% action on Bradley? At 90% action the line would have swung dramatically, probably to a Bradley favor. The entire point of running a house is to level the bets and bank off the juice... otherwise the House is gambling.
The house doesn't want to gamble. That's why they love slots, ********************s plunking in money guaranteed to lose 20%. But hey, they're getting an 80% payout! If the game doesn't have a house edge, they won't play. The edge in sports is built in the juice, they try to make the wagering player v. player (horses are the best example of this as it is real time in most cases).
Action gets skewed, but not at the 90% range without the line being closed and adjusted.