Beyond that, it's worth mentioning that BP was second on the team Equivalent Base Running Runs last season. This is a counting stat, but it seems to suggest Phillips didn't wipe out the value of getting on base more by making more baserunning outs. In all honestly, I don't know much to trust it, but in theory, it measures the value of other baserunning activites beyond stealing:
EqBRR is calculated as the sum of various baserunning components: Equivalent Ground Advancement Runs (EqGAR), Equivalent Stolen Base Runs (EqSBR), Equivalent Air Advancement Runs (EqAAR), Equivalent Hit Advancement Runs (EqHAR) and Equivalent Other Advancement Runs (EqOAR).
Even casting aside the statistical arcana, it seems possible that Phillips is making up for being caught stealing by going 1st-to-3rd more often and generally taking advantage of being on base by advancing farther on the basepaths. If getting caught stealing, and pick-offs especially, are a function declining quickness, maybe he should stay closer to the bag. But to the extent to which lead-offs help him advance on the basepaths, maybe he also sacrifices a little value gotten from being able to take the extra base.
I'm far from being able to roll this all up into a unified analysis, but it's possible what Phillips needs to do is to pick his spots to steal better, to accomodate for whatever deficit he has that's causing him to steal less effectively. Meanwhile, if feints at the steal, he can keep opposing teams on guard, while keeping himself in a position to advance on batted balls.
The critical factor remains staying in good position - whether in a potential pick-off situation or a batted ball. That's something that can improve with experience and, perhaps, the repetition of running in front of the same hitters. But it's also sure to be helped by knowing who you're running against (catchers, pitchers, shortstops, outfield arms) and when it's worth getting that extra jump.
I doubt Phillips is bad as his CS last season indicates, but he'll have to adjust his approach if he wants to take full advantage of increased time spent on the bases. Everyone else can help by hitting a home run every time they come to the plate.