Without seeing you throw a couple balls, its tough to make a suggestion, but from you said.... I'll try to make an educated guess. Even though you are bowling on heavier oil conditions, the increase in strength of ball cover/core (the new impulse zone compared to from older quantums) should match up to oilier conditions for you better. I would say pick a pin position you are most comfortable with... You said that you had some equipment with the pin over the ring finger that worked well... I would go with that. Since you do want this ball for heavier oil, I would probably suggest putting the psa in the strong (just right of your thumb) or in the arc (further right of your thumb) positions. both of these positions are likely to require a weight hole. Take the ball out and give it a shot. If it Isn't strong enough for you, try a scotch brite on the surface to give it a little more bite. On the other hand if it is too strong, then have your proshop put a little shine on the surface.
good luck,
S^2
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He was a big fella - 6'2"... 180
-Old Western Movie on AMC