Just my 2pence worth.....
The S.G. readings given are not typical of a fully charged wet lead acid leisure battery, after a proper equalisation charge you should be able to get the S.G. to 1270 or above (depending on the grade of acid used by the battery manufacturer). We have got some up as far as 1290 +
If you have a battery specialist local to you, it may be worth taking the set off and asking if they could fully charge and check the set for you, it is likely to cost you something for them to do it, but it might allow you to use the set for another year or so if they are given a clean bill of health. As mentioned by some on here, I don't believe a "proper and full" equalisation charge can be done with a normal marine automatic charger, as by their nature they will always reside on the side of caution when an equalisation charge requires extended periods of higher than normal charge inputs.
Of course the equalisation setting is always only going to be as good as the way the set is wired up... I assume it has been done correctly...
