One thing I have noticed with the ITECH batteries is they will charge to say 14.2V, then the battery charger will hold them at 13.5V float, however when the float charge is dropped off, they relax to 13.3V - all this might be a bit academic as its 98.5% off theoretical, but just a comment if you go chasing that extra 'bit', I cant get there and have the battery earth isolated after charging so there isn't any parasitic load in play. I am happy where this has landed, finally. I have ruled out an under charging battery charger also.