Really glad that everything has worked out for you. The AW IMR batteries are the only ones that I use too. All the other ones that I had before just doesn't perform as well. 4.5 is a good voltage to be vaping at. Although I'm more of a 5V person myself. Which isn't to much of a difference but I find that's my sweet spot. Haven't tried going to 6V but might try that out sometime. I've been hearing people talking about how great Boba's Bounty tastes at that voltage.
I like 6V for the massive amounts of vapor and relative ease of draw but really don't have any juice that does well at 6V. I'm going to search the forum to see if there is a list of juices that hold up at 6V. I bought a 510 to ego adaptor and I like using the VV box with my emdccs. With those I can crank it up to 5V and still get pretty good flavor without the burnt taste. But it has to be filled well and kept moist. I bought some Boge 3.0 cartos just for HV and filled one up with some Caramel Corn and it was just too much heat for the juice, imagine that burned corn smell you get when you burn your popcorn in the microwave. EW.