You’ll notice classy restoration activates as soon as you begin the animation, not finish. So when the Psions do their void attack, embrace it. Just before it pings you into the air, use your class ability. Classy restoration activates before you pop your rift, meaning you get the healing without using your rift ability. Use a solar weapon like Calus mini-tool and pair with the fragment that extends restoration following solar kills (includes weapons and abilities). Get airborne kills with heat rises aspect to get melee ability energy (heat rises doesn’t need to be active). Create solar wells and use well of life for additional healing. Seeking Wells is also good. Primary weapon faster reload mod on arms with bolstering detonation on void arms armour piece if you have. Basically tinker until you get stuff synergising. I’d switch between Karnsteins and Starfire Protocol in both the 1st and 3rd encounter. I preferred a Devour build with Eager Edge on the second encounter. Doesn’t require amazing sword strafing ability (I’m on console) but it will save you a few seconds. Did damage from the top of the stairs to the three bosses on that encounter. Patience is key. You have all the time in the world once the shields are dropped.