I have the Jackal and the Sigma Sting, with an older ball that fits between them (like Covert Revolt) .
I also like to play straighter or slight swing...say board10-12 at the arrows out to 7-9 at the breakpoint.
I have a higher rotation angle and medium tilt, so the pin up Sigma Sting gets plenty of length and a very strong backend - so for me, I will likely stay on the smooth arc side of the Motiv Ball Guide ...
http://www.motivbowling.com/resources/ball-guide.html Venom Shock is high on my list for next ball.
If I were you, I would wait to see what the reviews are on the new Venom Panic - it may be exactly what you are looking for. I am curious to see how it compares to the Venom Shock. If the Panic falls under the Octane it is too skid snap for me and I will still look at getting the Shock.
I have heard many people say that the Tribal Fire is stronger than it's slot in the Ball Guide - I wonder if it could move up into the spot vacated by the Sigma Sting with the Panic going into the Fire's old spot? Not sure.
If you really need a light oil ball - most seem to prefer the Ascent Apex.
Just my 2 cents...hope it helps.