DP3,
I would agree with ambi1, if you want to stick with Ebonite, the Vortex II solid is one versatile ball. Sanded for heavier oil and polished for lighter. Also, I would consider the Hammer line of balls. Since Ebonite now owns Hammer, they most similar to Ebonite. I have the Vortex and 3 Hammer balls (Vicious, Blade Particle, and the Blade Pearl) all excellent balls. I have 2 Columbia balls (the Wicked and the Sport)which would also work for you.
Just my opinion,
dead wood