Curelyon on the original Black Thunder was extremely angular and aggressive back in its day. I have two Thunders that I get a very angular look from even now, but the overall movement of them both is substantially less these days with the higher oil concentrations.
I would hesitate to call Curelyon "mild" or "controllable;" to get controllable you need some surface. Polished, that's one of the most angular coverstocks Storm ever built. I had forgotten just how angular until I saw an old Pete Weber video on YouTube recently.
I also have a Dark Thunder; compared to the DT, a Curelyon ball should go a lot longer and be sharper at the breakpoint. It will be in the middle of a DT-Maxim comparison.
Jess