jrnymn7,
You describe perfectly normal behavior. Not only does sulfate have to be driven back into solution the affected surface area of the plate has to uncover microscopic nooks and crannies. The reversion takes time. Voltage and amperage values will vary.
I am wondering if a 300 watt DC to DC booster might be a valid alternative to do this. Leave the converter be and control the process through the booster.
It is important to limit current. Amperage cannot just run wild and voltage allowed to immediately rise to 16.0
With a DC booster set to 16.0 volts and a 12 volt 50 watt light bulb hooked in series for 5 amperes current limiting, or a 100 watt 12 volt bulb connected for a 10 amp current throttle (it's not exact but close enough) let the converter relax and let the DC to DC converter do the work. Make sure the converter is a 300 watt model. They are a piece of cake to hook up and so is a base for the 12 volt light bulb.
Charge until one of two things happen. The SG reverts to original density OR 16.0 volts is reached. There is about an hour and a half time lag for the last .05 to be gained. Chemicals at work. Also keep in mind electrolyte temperature compensation.
5 amperes is recommended for a 100 ampere hour accumulator
10 amperes is recommended for 200 ampere hour capacity.
If I remember correctly an equalization time record of 15+ hours was set (small battery) with a set of US battery GC220 units.
Hope this helps
