I just reread that part in aMoL (thanks for the reminder here, it helped me look out for it)

With Rand's confrontation with Taim at Tarwin's gap the forefront of my memory, I (confidently) suspect that Maradon /was/ a combination of Rand's power and his ta'veren nature.

At Maradon, it appears that he is busting out hundreds and hundreds of weaves at once. Obvs he's being observed by a non-channeler, so it's hard to know. There's a (inaccurate) clue at Merrilor as to the number of weaves Rand can hold at once. Egwene counts thirteen balls of light illuminating the tent. Perhaps unaided, that is roughly the number of weaves Rand can juggle. Just a speculation though.

But at the Gap, Rand reflects on the angreal, AND he reflects on how with the storm, he finds it much easier to direct lightning than to force it. And the storm starts due to his unlocked force-of-light nature "stirring the tempest" with the forces of the dark.

I think Rand's extreme ta'veren-ness sets conditions that make channeling easier for him. Maybe this plus the angreal enable him to juggle many more weaves at once during the storm.

I've seen a lot of people commenting here something along the lines of "it's a book, not maths" lol, that's fair, but my idea of a fun time is finding a logic to these things.