[2021] Are ignite based dot builds viable?

Leveling a mage and about level 50 now. Using disintegrate and stacking a lot of ignite chance and damage over time/fire damage.

I have well over 100% ignite chance and yet disintegrate doesn't apply ignite stacks reliably on the first tick.

I was hoping to make a sort of street sweeper build that applies ignites and let's the DOT do most of the killing, but it doesn't seem to be working out that way. What gives?