Welcome to the forums!
I know I’m a little late to the party, but anyway…
- One of the reasons why you may feel squishy is the fact that you don’t have any life leech to AAR (unless I overlooked something). AAR does 0 weapon damage on its own - it’s a spell. So you normally can’t life leech with it.
- To fix this, get a Pulsing Shard. It drops from the Aetherial Amalgamation in the Rotten Croplands near Homestead. Drop chance is rather high, so no hassle. Any affixes will do for leveling. The important thing is the “6% damage converted to health to AAR”. Basically, this is the ultimate leveling offhand for any AAR build, since it allows you life leech wit AAR. You’ll feel a lot better with it.
- Devotions are somewhat suboptimal. Typhos and Raven for example are pet constellations rather. Same goes for Throne except for the first node. Even if you don’t have the gear yet and also haven’t reached level 100, you could use this build as guidance. It is a simple, but strong AAR spellbinder. Since there are no major damage conversions involved, the build will basically work with everything - just not as good as with the items in the GT.
Good luck and have fun vaporizing everything with that laser beam! 