I’d say that’s a question for your fitter.
But it’s possible that the angle of your cleat rotation is not appropriate. Even if the fitter matched the previous angle, the shift from full front to full rear may mean a different rotation is appropriate.
Adding to that, your saddle height and fore-aft may need some tweaks too. Perhaps your fitter handled that and you didn’t mention it, but it’s worth a thought too if they weren’t altered.
I have zero expertise in biomechanics. All I know is when I had a bike fit the guy moved my cleats back quite an bit and angled them slightly so my feet are very slightly splayed as they would be when standing, and lowered my saddle. I also had custom insoles made at the same time. Everything feels so much more comfortable and natural - can’t really describe it any other way.
Yup.
Cleat positioning is in my mind black magic. My cleats were adjusted by a former world tour pro who does bike fits and the like now. After tweaking the fit on my bike, he had a look at how I pedaled, adjusted the cleats once, looked at the improvement, made a tiny tweak, and now they feel perfect. I have no idea what he did. When I asked him, he said, he eyeballed it.
Only potential drawback I have noticed is increased toe overlap. Really only a problem when I am stopped at a light and allow my wheel to turn and then it turns green and I straighten up to go and nearly trip, lol. Never an issue when riding.
Yeah often get black scuff marks from tyres on the toes of my white shoes
I’m probably other extreme and the marks on my shoes will be at the heels from scruff the chain stays.