From what I've seen, the Passion is a fine ball, you just have to know how and when to use it.
In box finish, you'll need some pretty good juice to keep the ball from burning up. If you have enough oil, the ball will read nicely and make a smooth, powerful arc to the hole and provide very solid carry.
If you want to use it more or get more backend out of it, brining the surface up and maybe adding a bit of shine would be the way to go. When I've seen people throw it, this is usually what I've seen.
So, I definitely don't think the Passion is a bad ball; you just have to know how to match up with it.
Still, I would probably go with the Awesome Hook or even the Total Shock & Awe if you want a true oiler. I've owned both, and the Total was definitely the better heavy-oil reactive of the two. The box surface gets that ball rolling very, very early. The AH is also quite aggressive, but it wants to push down a bit further, which I did not care for on heavier patterns.
If you want something for truly heavy, the Passion might work, but I think the Total Shock & Awe will work better.
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I've only bowled 300, but I've benched 345
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