As others noted, the author is trying to "goose" his charging capabilities rather than having a good, initial setup. Also, I can't think of a more accurate way to measure the characteristics and charge level of SLA batteries than taking hydrometer measurements from the time when installed to current use.
FWIW, I've found that higher voltage charging, particularly for 6V GC2 batteries brings the best results. I have my solar controller, temp compensated, at 14.8 for Abs and 13.6V for float. When in storage, the controller only briefly stays in Abs and then reverts to the float voltage. There are settings in the software where different voltages and durations can be set. Setting the low state of charge set point to make the controller come out of float and into Abs is also available.
In the Winter, I sometimes find the controller has the batteries up to 14.9V. They seem to thrive at the higher voltages for that small window of time.
