You have your mediums covered. Look at the Arson Low-flare for drier conditions and pick your poison at the top end. If you want to stick with Hammer there is the Deadly Aim or Black widow legend, Ebonite has the Pivot, or Track has the MX16 if you want to stick under the Ebonite brands.

I feel like the Ebonite brands don't have a true heavy oil ball right now, if I had my pick I would go with the Radical Guru or Brunswick Mastermind

I am a low rev guy, and throw the Legend effectively on the heaviest patterns.  Much better for me than Mastermind or other hook monster solid. 

the black widow legend is definitely a stronger piece.
depends on how strong of a layout and surface used

Low flare is great dry lane ball for sure

the only true heavy oil ball is the cold blood and the absolut hook

What information release

Also consider the Nail Titanium for drier conditions.