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What manual are you referring to?
Adding a larger or additional ground to the car will help. However, considering my 97 Honda has the ELD, I am sure the Nissans have them as well. It is to increase fuel economy as well as increase the life of the alternator.
One way to get around the ELD design, is to add some resistors in order for the ELD to detect a load and have the alternator put out the 14 volts constantly instead of the 12.3 under non-electrical demanding driving periods. If you're worried about electrical draw, swap out as many lights as you can to LED's like the Sylvania Zevos.
Any reason you're wanting to go to a AGM? The only real benefits of them are that you can mount them in any position, don't have to worry about deadly gas, and a slower self-discharging rate. Unless you are adding one for your system like in the trunk, you aren't really going to notice much improvement. I would just get a replacement alternator with a higher output.