Bulk, float, equalization levels for Costco 6V batteries

I think I get pretty good EQ readings on a funky T-1275 when I use 15.0V to charge for Vabs. I accept, as others do, that it's a Problem Child to get it topped off, and that it needs an EQ job when I get back from a week or two camping trip to really get the lead out of and off of the sulfur that needs to get back into solution as Sulfuric Acid, where it is then ready for some extended storage time. A topped off battery is a long living happy battery when left in the storage yard or driveway.