I don't find my Cruel Intent to be a true heavy oil ball, but the Covert Revolt sure is. The biggest oiler Motiv has right now is the Jackal, it's a real beast that hooks hard.
There is a lot of room between the box finish Sigma Sting and the Accent Apex. The Venom Shock fits that spot pretty well for me. The Venom Panic would probably fit there as well, even between the Shock and Accent, but I have not thrown a Panic yet.
How do you like that Cyclone GB? I have two of them, but have not drilled one yet. Interesting ball to say the least.