What charger did you use to commission the batteries? If you used the IOTA charger and if so, were you able to get them all to 14.1vdc, like manual states?
We used the Aims converter to charge each battery individually and we were able to get each battery to 14.1vdc before running them in parallel. However, if the IOTA charger meets the battery specifications, it should be able to get the batteries charged as well. Here is a link to the video we did on the Aims converter: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-H7Thh-bgrTM.html