Does NOT add 33% to the last tick.
I'm seeing this everywhere and I MUST correct it.
I repeat, it does NOT add 33% damage to the final tick.
For a properly spec'd afflock:
It adds 97 damage to the previous tick. In fact, Curse of Agony was changed now, that each "series" of ticks now does 97 damage more than the previous "series". The glyph adds a 4th "series" that is 4 seconds long and 2 ticks.