Try either the High-Rev (a little longer and not as much in the backend) or the Big Rig Diesel (a litte more in the backend).
The Hammer staffer who owns the shop that I drill at has taken the polish off his Big Rig (one of them at least) and drilled it pin down, this thing checks up real nice in the midlane and then SCREAMS through the backend. Not sure if it could cover heavy oil, but definitely heavier mediums.
If you get any heavier oil, then you get into the particle shells (Big Deal, Hawg, Razor Blade, Real Deal, etc.)
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Andrew Loose
"Evolutionary. Revolutionary."