Dr Rev,
How can the Jekyll and Hyde both be good replacements? The Jekyll I can see... but the Hyde is a heavy oil ball.
I don't know if the Slay/R is really what you'd be looking for. IIRC, the Scream/R was somewhat aggressive. Have you taken a look at the Stinger Low-Flare by Ebonite. It has been re-released as the "Ice".
Clint, don't be afraid of trying the Blazing Inferno. If you can get one cheap (reasonable), I'd pick it up. A bit of warning, though: don't drill the ball too weak. The activator cover is hard and durable... it skates easily through the heads. Because of this, the ball can be drilled on the stronger end and still retains energy well.
In fact, I was going to suggest you try a Blazing, but I thought it might be too expensive. However, if you can find them on eBay: get one.
