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Sorry, I'm confused, what is causing you to think anything is wrong?

Any lead batt once depleted, say to 50%, will take several hours to get back to 100% Full, no matter how powerful (amps available) the charge source.

AGM's faster acceptance rate only applies to the early Bulk stage, doesn't speed up the overall process by more than 15-20 minutes.

Put an ammeter on the batt while the charge is finishing (3-5 hours). Did you get an endAmps spec from the batt mfg? If not use .4A (.005C)

You should set your charge source so it holds Absorb voltage until trailing amps has declined to that rate, that is the 100% Full point, and only then should it drop to Float voltage.
 

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Are the AGMs healthy, relatively new?

Are you sure they are actually depleted before charging starts?

Do your charge sources have adjustable voltage and Absorb hold time settings? If so what are they set to?
 
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