Assuming we are still talking LiFePO4
Your charging source(s) are set too high! Can they be set to lower voltage levels? If not then I would suggest you have unsuitable chargers/controllers.
and 14.8(9)V should never be mentioned in the same thread.
14.9V is far too high and will do your battery no good long term! A minimum 3.725V (if all balanced - unlikely) cell voltage is well out of spec.
In four years of fulltime travel with an AA Solar supplied 300Ah the highest voltage ever recorded was 14.3V.
All measured at the battery terminals.
My almost unused Victron mains powered 30A battery charger reaches 14.2V and then "floats" at 13.50V.
The Victron solar controller reaches 14.2V then "floats" at 13.45V.
The alternator charging reaches a maximum ever of 14.25V limited by a Victron diode block.