My point on SG was that you added the water, so that dilutes the acid from what it would have been after a full recharge. Now you will have to do some cycles to get that right.
Recharging also heats up the electrolyte, expanding it, which is less dense and that is why you let the battery sit till it cools off to get the proper SG reading (which will be higher when cooler)
Yes, 1.300 is the "new 1.275" it seems. Higher SG means faster eating of the plates, so you will need new batteries sooner. But it has its good points too.
