In designing your arsenal, you have to keep in mind what percentage of play is on what type of conditions, and have equipment available to meet those conditions.
If your trauma works great in light oil or dry conditions, then keep it as it is for when you play those conditions.
In heavy oil conditions you really need more surface to the ball. Sometimes just breaking the
shine is enough, and other times heavily sanded still isn't enough.
Some of the new balls out that are getting good reviews in oil are the
Columbia Bully, and Big Bully. In
Ebonite the V2 sanded, V2 Strong, and V2 Strong/r are performing well.
Another thing to remember is that the release dictates skid moreso than the drilling or the core. If you throw with a high axis rotation in oil, it will skid even if it had snowtires on it. Just the same a cars tires will hydroplane on ice or water, the ball is more suseptable to hydroplaning if its rotational angle is 90 degrees to the direction of travel.
So in oil we want an early roll, and a gyroscopic roll, with approximately 30 to 50 degrees of axis rotation. This will keep the energy in the ball focused on the direction of travel and be released in the backend.