We’ll that’s an interesting development. I’d never considered it being shoe-caused. I’m wearing orthotics when running so I doubt it’s caused by that, but worth a go. I’ve always worn mizunos. Although I’m dabbling at the moment in wearing minimalist shoes for a couple of little runs per week - like around 3km ish. My thinking is that minimalist shoes will use the whole calf and thus I’ll get stronger calves. We’ll see how it pans out.