I don't want to sound too optomistic, but it does sound better than when you first started. Your readings say it's about 75% currently. Target sg should be around 1265 to 1275 for all cells, and total voltage at 25.4v. If one cell is off by 50, thats enough to cause headaches (called a bad cell). I think the next step would be to charge again- does the charger have any selectable settings, or is it one that just has a go button and turns itself off after some preset time?
The step after this is to find a load to attach to the battery. You'll have to know precisely what that load is. Find something that can draw maybe 10 amps...maybe a couple of big lamps, a fan or a heating element. With a multimeter, confirm the amp draw of your load, and note it. Now, with a voltmeter connected to the batt, attach the load and take note of the battery voltage and the time. Note the voltage at say, 15 minute intervals. At 10 amps, this batt (new) should be able to deliver that 10amps for 87 hours. In your case, note how long it takes for the voltage to drop to 24.0 volts. From this info, we can roughly figure out the overall condition and it's usefullness.
Keep your fingers crossed.
David