[Miller]

On one hand... this makes sense, on the other I don't... see much of a balance concern with this?

Wretched Oil is usually a damage loss without a casting implement unless they have an absurd amount of armor + DR which is usually the result of body guard.

There's a point to be had in Black Bubble but I don't particularly think martial classes utilizing hexer without a casting implement are much of an issue.

As stated in the OP, these builds often only hover around 100-140 inflict at best due to the lack of building will (usually), cutting it in half would effectively force all of these builds into a 50~60% chance at an inflict against someone with zero stat investment which would almost always run into a negative momentum trade off unless what they're trying to prevent with Black Bubble is super crucial to stop.

I just can't get behind this at all as presented. You may as well just disable the inflict if you don't have a casting implement with a penalty that huge.