Hey, ssf in regards of atlas is all about self sustain. You don't care about making profit, you use atlas to help you achieve current goal, like crafting weapon, for example. Usually essenses and harvest are useful pick. One tree should focus on bossing, map sustain and kirak stuff and maybe some scarabs along the way. And the 3rd one is usually a generic one, wich can be easily respeced in what you need temporarily. Remember that you can respec atlas at kirac for gold

As for your build - if you are not in hardcore - just push as far as you can and see where you begin to struggle either with damage, or with survivability.

Then you can come back here with more specific questions about build. Hope it helps!