This was the entire point of the change. People were using a VERY limited range of cc options because poison just killed low HP troops too quickly. They changed the spell to allow small, fast-moving troops to be poisoned but still live if it wasn't done right, and also high HP troops to be killed if done right.
The goal wasn't to make it more or less powerful, but to make it affect different troops in different ways in hopes that cc troops would once again become more diverse. It's another reason they made the change to the lava hounds as well.

