Lead-acid battery equalization

[phorvati]

Has anyone done the equalization of their lead acid batteries. I have the Xantrex XAR regulator which has an equalization program. I set mine to 15.8V and various times like 2.8h or 2.1h. I am a bit puzzled with the output. According to Nigel Calder you should keep the current down to < 5% of the AH rating so 5 amps for each 100AH. This way you don't cook the batteries. During equalization, voltage never gets to 15.8, its more like 15.4 but only after I increase the RPMs to 1000, and then the current is more like 45amps, too much for my bank. The battery seems a bit hot, its bubling, but the battery temp sensing switch never shuts off the regulator. So i can only assume that the batteries are not 125F yet. Anyway, specific gravity in my two oldest batteries is not moving beyond 1.230. At idle RPMs the voltage is 15.2 and current 25A. Should I force the voltage to beyond 15.2 and even beyond 15.4 by increasing the RPMS to 1500 and then have higher amps flowing in. The risk is overheating but would that make the specific gravity get higher to where it should be like 1.265? All my batteries are torjans SCS225 and the two older ones have uniform 1.230 reading across. The two newer ones have 1.250 reading, and bubble less. I equalize them all at the same time.
Thanks,
Petar