Thanks Siouxie! This was another good example, for me, of why I am always cautious to say I am not writing a review but a first impression when I comment on something that I just started using. It probably didn't help that I was rotating between 2 triple cartos.
I am finding that 4.7v is starting to produce really good TH as of yesterday. Its possible it needed breaking in. I can't chain vape it at 4.7v now without my throat drying out like a wet sock left in the Sahara for a week. Also, the flavor boost is a bit more pronounced starting yesterday.
My Ego booster's dial fell off (and a new one will be here on monday, from halfway across the world, just to comment on how amazing support it for that mod) so I'm kind of stuck at 4.7v right now, but I think I still wouldn't go lower than 4.5 on it. I won't know for sure without a good week of using it though.