DZ,
This is tuff to comment on, because you don't list your rev-rate, or overall ball speed inyour profile. I haven't thrown the Mayhem yet, but I have many friends who throw them, and I've seen them used on lite oil to medium heavy oil. My first impression of the ball was that it was an oiler. But after watching a very skillful buddy of mine throw a sanded Mayhem in a tournament recently and shoot 241 and 219 for the first two games, I had to change my opinion of this piece. He was shooting on a dryish condition, which I had to use pearls on! Go figure.
If you throw fairly slow speed, say 14-15 mph, then yeah, you could probably get away with using this on medium hvy oil. I guess it all stems on whether you can complete consistent shot-making. Personally, I have a Hercules that I can use on medium hvy oil, but that's because of the way I throw my ball. TO me these MoRich balls come with built-in Hook. They take off like Energizer Bunnies when you add a little hand to them. So a Mayhem for me is like, wayyy too much ball.....but it just might fit your game, perfectly.