In my opinion, you should use the One after the Scorchin, then the Cobalt. The Cobalt is not going to like carry down much at all, and skates in oil. It does have a sick backend, though, so it will help with entry angle. I guess if you keep your line far outside and let the ball start up before it hits carry down, it will have a chance.
Flare in my terms describes how far apart the oil rings on the ball are, hence how much does the axis of rotation migrate as the ball travels down the lane. More flare means that it is more likely that a fresh part of the ball is in contact with the lane surface on every revolution. The oil rings will be farther apart the more a ball flares.
It is actually possible for a ball to over flare and have a negative effect on the reaction you get, causing the ball to cover FEWER boards.
Backend depends on the context. Obviously it is the end of the lane nearest the pins, where there is usually little or no oil. The ball uses this part of the lane to create friction and therefore hook. Some balls are designed to roll early (in the front part of the lane), others, like the Cobalt, are designed to skid in oil and grab hard on the backend, creating entry angle.
That is my rudimentary explanation; I'm sure someone else can put it more eloquently than I did.
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