How I like to run [Baruuk].

[Stretch] is a flex spot. Consider swapping in [Augur Secrets] or if you need lull to last, [Constitution]

You can run [Fleeting Expertise] if you want to instead of [Streamline], but I prefer having some duration on lull for certain scenarios. I never find i'm low on energy anyway.

Playstyle is pretty straightforward. Always make sure you have your 3 up, if your knives drop below 9, recast it when you get chance. If you see a reasonably sized group of enemies, press 2 to lower your restraint. When you're dropped your restraint a bit this way, press 4 and laugh.

Regarding arcanes, strike is very strong. Avenger is nice, but could be swapped for [Guardian] if you're having survivability problems.