I'm afraid I can't speak too intelligently about this because mob distribution and locations were changed pretty significantly in patch 1.18. I've also noticed that Yellow Gremlin has kind of outdated lists of mob distribution. It's still a good place to start, though, since it's really easy to use. Just realize that they date all the way back to the first days of FFXIV, and some mobs have been moved since then.

And like Murugan suggested, partying up is a great option because you can take down mobs much easier, and you only get slightly less SP (in fact, if you duo, you don't get any less SP per mob). Just make sure the person(s) with whom you're partying are within 5 levels of you so that you both get the most SP possible. And when you get enough people, try fighting mobs that are at least 10 ranks above you. Mobs that are 10 ranks above you give the most SP.

And for the record, I completely agree with Murugan on soloing puks. I went to La Noscea and solo grinded them, too. When they start to glow, just move around to the side so they miss you with their backflip attack. There used to be tons of them out by a Lighthouse near Camp Bloodshore. But I haven't been there in a while, so they may have been moved out.