60s is 150% of 40s, therefore the cooldown is 50% longer, or was it the 75%, 700 is 175% of 400, there the potency is 75% more..... that better?

Nothing was wrong with my math just your comprehension, and I realized that it was because I was able to let tanks drop a lot lower in low level dungeons thanks to ED but in high level stuff it is much less of a % of the tanks hp because bene is also much less since it used to heal about 50% of a tanks hp and now much closer to 15-20. At least for how badly geared my fresh 60 alt is. I just completely forgot about the scaling with hp part, sorry about that.