I haven’t tried boost range with PSI, but I’d be more curious with boost range on Dark Blast, especially for cones and Cone immobile. Pair it with either Leviathan or Soul and you can add two more cones each has a second immobilizing cone and a ranged hold. With cones more range equals more Area of Effect and specifically with immobilizing cones stacking you should be able to immobilize many outside of enemy range to attack you. You have at least two holds to pick up stragglers. Work on ranged defense but you may not need it.