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What's surprising is how big the front cracks are yet the front disc has over 56% life left by thickness.
I run mine down to 32.1mm (they start at 34mm and are dead at 32mm) but I didn't have cracks that long. I use project Mu pads which are superb, and do a cool down lap whenever possible too.
Anyway, looking at them, I would absolutely still use the fronts until cracks get near the disc edge, and inspect them regularly. It's the edge of the disc I understand to be the point to watch re cracks, not the slots.
Rears obviously are fine.
I assume you bed the discs as per manufacturer guides when new?
Ooofff, those fronts look tested. If I'm not "racing," I do a fairly nice cool down. You'll be surprised how much longer rotors and bearings will last....
SN: No love for Ferodo amongst most Pcar owners unfortunately.