Playing storm totems with this set is a particularly tedious affair in SR and even main campaign: Waiting for storm totem cooldowns as you kill one pack and move on to the other and have to re-saturate your storm totem count is not fun. Particularly with conjurer, your entire damage arsenal requires ramping (stacking totems and sigils) to reach maximum damage output. This takes too long–even with the stone of halakor, which only makes this set somewhat playable–and results in extremely clunky, unsatisfying clear where very little of your damage is front loaded in a non-dot build.
The solution is simple: grant valguur +1 summon (burst, not max) to the 4pc set bonus.
As we (hopefully) recall from the infamous ana hat + meteors incident, gating damage behind clunk is not very cool, and valguur totems are particularly clunky!