Hello,
This is more of a hypothesis really, but here goes.
It has always struck me as somewhat incongruous that (SPOILER) an Honorblade empowered Szeth cannot compared to a Nahel Bonded Kaladin. Why is this? Welp.
What makes Kaladin so much better at handling Stormlight? It is his bond with Syl. And we see his ability to handle Stormlight grow with each new ideal he speaks. Each ideal is an oath, and each oath given increases his ability to efficiently hold Stormlight.
We also know that the Nahel bond and spren bonding with men is a form of imitation of the Heralds and their Honorblades and was not necessarily expected by Tanavast.
So why is Kaladin so much better at holding Stormlight than Szeth with the honorblade?...
It is because Szeth is not bound by the Oathpact.
My hypothesis is that Heralds bound by the Oathpact in conjunction with their Honorblade can hold and use Stormlight on a massive level.
We've already seen(SPOILER) Taln's extreme reflexes and ability when he saved Amaram at the end of WOR.
I suspect if he hever becomes sane again that he will be able to use Stormlight at a massive level.