The Super Sportster will knife edge. I have a buddy who used to fly his Super Sportster .40 ARF with an O.S. Max .50 SX, it's pretty impressive what the Super Sportster is capable of with the right setup.
I looked at the SIG Four Star but from what Ive read seems it might be a bit boring.
I hope that all of us have the benefit of being bored by a Four Star or Goldberg Tiger!
That's a good problem to have. Still, it seems like an odd statement after watching your Super Sportster go in. I thought finding something a little more mild was the idea?
You could always consider a Big Stik or Easy Sport; either airframe would be more stable than the Super Sportster but plenty capable of solid aerobatics. The Avistar would be pretty exciting with a .46 AX on the nose, though, as well. I seriously doubt that you'd be at all unhappy with a Four Star or Goldberg Tiger though. I know a number of very good pilots who keep Four Stars and/or Goldberg Tigers in their hangar for days when they simply want to relax with some crisp sport flying.