To pulse or not to pulse
Flooded lead acid batteries are full at 12.7V and empty at 11.5V. Charging at more than 0.5V over the full charge "on the charger" is unnecessary and damages them. Each cell is about 2.1V and charging at 2.25V and watching the battery itself does not go over 2.1v is the way to go. Multiply by 6 for a 12V battery. 

So, 13.2V to 13.8V on charger and be sure the battery does not rise above 12.7 V. Keep the batteries topped off and never discharge below 11.5V will keep them pretty good. I think a constant voltage is the way to go and as the battery fills it will naturally reduce current as above . I don't see pulsing it will help anything or save any power unless maybe you are in a float charge state ie ,holding it at 2.25V