Particle pearl is very good for carrydown. Stuff that is too strong will rev up too quickly and back up when it hits the carrydown, while stuff that is too weak will skid through the carrydown and hook too late. When I talk about carrydown I talk about it in its typical case. I will briefly outline that here.
Carrydown is a phemonena that most encounter after numerous games have been bowled on a pair. Bowling balls, as they roll down the lane, push oil, and also absorb oil. In today's game generally oil is absorbed more than it is pushed. Bowling balls flare (have multiple tracks) creating greater absorbtion as fresh surfaces are exposed with each revolution. In addition to this (and perhaps even more important to overall reaction) bowling balls are made to absorb a great deal of oil in order to hook more. One more factor, though not as important as it once was, is the softness of the cover. The softer the cover, the more of the ball will be in contact with a lane at a given time once again leading to greater absorbtion. All of these factors contribute to a lane drying up, and all of these factors (hold the final one to a degree) have been exacerbated with the advent of new technology. Yet despite all of these steps to add hook, and remove skid, oil is still pushed down the lane with every shot.
This is why one often notices that as oil is being carried down the lane, oil is also being removed from the lane. One also must notice instances in which oil is being pushed to a great degree, specifically when a spare ball rolls down the lane. With only very slight degrees of flare, oil absorbtion, and "lane foot print" spare balls tend to push oil with much less absorbtion. The ten pin (or seven for lefties) is a common leave and is often shot with the use of a spare ball. This is the reason that many times a bowling ball, if it gets out to the gutter or first few boards too late, it will push.
Now, to adress what ball you should get to combat this. Particle pearls are usually good choices when first seeing carrydown. In theory, they get down the lane because of the pearl, yet have the traction to be predictable on the backend because of the particle. A ball like the AR is the type of ball that would work on carrydown if the initial condition is heavy. If the condition is more of a medium, a ball like Storm's Pyro would be a better choice, if lighter, the Venus from Rotogrip is a good bet. These bowling balls also are all pretty much arcy. This should allow you to either get inside or play up the boards with good success to combat whatever weird qualities spare balls add to the equation.
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