Replacing original Ritual Specialist

Hi, I've had a Ritual Specialist for about 4 years now (back when there was just one model, would be called the 95 now) - it's starting to show signs of delamination on the head. So before the head cracks off, I'm looking for a replacement.

The original had a grooved shaft - which they've removed from the new model.

So I'm looking to replace it with something with a grooved shaft - drag flicking profile and high carbon content for similar stiffness.

Any suggestions?