Sticky/stuck/wedged/frozen piston (Not likely if same both sides)
Damaged/clogged crossover tube. (Not likely if same both sides)
Contamination of the outer pads. (grease or other CF lowering / pad damaging compound. Could include "tire dressing" or "wheel cleaner") (Likely if same both sides)
Bad fluid or air in the caliper would affect the whole channel, not just one side of one caliper. How is rear wear?
Same on both fronts? If LI+LO = RI+RO or close to it then the system is probably OK. I'd focus on the pistons/pads on the side with the least wear and the crossover tube since lower wear is on the outside. One of those is likely where the issue is.
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