I have both the planes you describe, similarly equipped, and I enjoy them both. You're right, the 4* doesn't roll like a Twist. It doesn't have the control surface area and deflections of the Twist. The only thing I suggest you change is your mind set. The Twist can be wildly acrobatic and if that's what you want, then fly it. The 4* is more like a poor man's pattern plane. It flies straight, true and "on the wing". Use it to practice/learn/demonstrate moves that require finesse, like inverted flight, perfectly round loops, huge inverted loops, 4-point rolls, slow rolls, hovering, rolling circles, sustained knife edges, graceful coordinated turns, and silky smooth cross-wind landings. I expect there will be posts that suggest different mods to help the roll performance of the 4*, but it will never roll like your Duraplane or Twist, it's not the plane's character. So, just learn to appreciate and take advantage of what the 4* does well and fly the Twist when you feel like banging the sticks. A 4* flown well by an expert pilot can be a thing of beauty and grace.

Live long, and prosper
Jerry L. Gubka