Awesome, I've been hunting for the right voltage since I got mine, I had it a 5v and it was pretty harsh but I was trying to get good vapor out of it. At 4.28v it tastes much better but the vapor is still less than the Titan. I'm still having problems with Titans being very finicky about how tight you screw them into the connector.
I use my 2.0 bf @ 4.23v and have my 1.5 on my 3.7 Vmod........I highly recommend trying these hybrid bf attys..
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