With your ball speed that low, I suggest these 2 balls. The first is a Freeze Solid with a surface of 4000 abralon with no polish. The Freezes still have some strength in their covers for most THS conditions as their coverstock was the high end cover of about 5+ years ago. Most THS conditions havent changed that much in 5 years. Once that ball gets to be a little too much, step down to something like a Slingshot.
Even though the balls mentioned (Endure, Violent Eruption, and others) are excellent balls, I would steer you away from them with that low ball speed. Those other balls mentioned may force you to stand farther inside and play a part of the lane you dont like. From what I have seen from others with slower balls speeds, the Freezes work really well.