First off I wouldn't automatically head for a heavy oil ball. Unless your bowling a PBA league or Tournaments most leagues don't put out a heavy oil condition. I would suggest looking at something in the more medium category first. Hopefully you have a good proshop in your area who can watch you bowl and make good recommendations but here are a few I would consider. If you want to stick with Colombia I would go with the Delirium Shock or the Severe Delirium the shock will be longer and snap more where the Shock will be earlier and handle a little more oil than Shock both balls will handle more oil than the Freeze.
Brunswick mastermind Einstein or Braniac are good.
Storm Rocket.
Hammer Arson High Flare Pearl or Solid
Radical Rave or Ridiculous
Rotogrip Hywire or Haywire
Any of these would be a good step up from your freeze. Generally the polished balls will handle less oil and be more snappy on the back. The more surface the more even rolling and will handle additional oil. Hope this helps.
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