when should a powermax pm4b drop into float mode

Landyacht, you also have SG lag too. It will continue to rise after the charge has been removed so if you get close enough when equalizing, 9 times out of 10, you'll be right at your baseline a few hours after the EQ is done. If your SG stops rising, stop the EQ. Wait a few hours and check SG.

jrnymn7, batteries gas when charged. That's completely normal. 6V's will gas more because of the antimony content. You want the batteries to gas.