I have posted this before, but it applies here too I think.
My almost 6 yr old Interstate 232AH 6s (GC2 XHD) are still apparently doing well, now down to 90% of original capacity by my last load test. I have no idea how many deep on them. Not a full timer, so not a huge number--maybe a 150? )
Once I get home from doing 50-90s away, I have always followed getting them to "full" (according to the charger) at 14.8 by giving them some time at 15.7 to get the SG up to "true full" (which was 1.300 when brand new, at 35F in Feb 2011)
Lately I have found that they will also reach "true full" SG if I leave that 14.8 on overnight and never do that 15.7 thing at the end.
It is all about how long you leave them at 14.8 after they are "full" (But aren't quite yet truly full.)
The trouble is leaving them at 14.8 so long lowers their water some, and I suppose does bad things to their plates. Anyway, it sure gets them "truly full." :)