Pestilence suggestion

I recently just did my first pestilence. It was in the sewers and I was roaming around for about 20-25 minutes just to find the last mob I needed to kill.
I would like if there’s some sort of indicators as to where mobs are when you hit a threshold on the meter.

I was thinking to be fair and balanced at 5-10% left of the meter, the game highlights the mobs or something of that nature. I guess I was babied by POE elites highlighted, but I really was upset when I had to spend 25 mins roaming around.