I've had a tamer for over 10 years and honestly I have no idea wth you guys mean when you say 4.6 or 4.9
On the topic, I used to like the spot in Illenshar. I forget the exact coordinates, but it's past the lizardman camp, into a maze like area that has a couple poison eles in seperate locations each with a pond of green crud and there's also a dragon/drake area above where the nightmares spawn.
I haven't gone there recently and assume they still spawn there. I liked it to because the spawn was fast and there's nothing else around it.