After further review, I've realized that her skill makes it so every hit from the enemy counts as five hits for Jane's passive, meaning instead of 4 hits to trigger her heal, Morella's skill would count as 20 hits, all with a 50% chance to proc the heal. I didn't understand this while making the video, nor did I realize when I did that 500k run, but that's probably the difference maker. Jane is still perfectly fine and shouldn't be tuned down trust me guys.
After further review, I've realized that her skill makes it so every hit from the enemy counts as five hits for Jane's passive, meaning instead of 4 hits to trigger her heal, Morella's skill would count as 20 hits, all with a 50% chance to proc the heal. I didn't understand this while making the video, nor did I realize when I did that 500k run, but that's probably the difference maker. Jane is still perfectly fine and shouldn't be tuned down trust me guys.