That 12.2 is a puzzle. Usually you charge to full before doing an overcharge. I wonder if you jumped the gun here and are just doing the regular recharge but at high voltages?
Or it could be just the added water messing with things until it gets mixed in after a couple of deep cycles. IMO do a real 50-90 and then a real 50-99 (no solar during the discharge time so it will get down to 50% ok) and then next week when that is over, check it out and then do the overcharge from the 99 and then see how the SG is doing.
