Looks like mine are going to sit in the box until I can get a true 3.7 box mod. They just taste like nothing on my ego and have very little vapor. On the other hand, dripping juice right on the atty of my ego produces amazing vapor and flavor, both on the regular atty and even more on the LR atty.
I did read a thread that tested the batteries on several models and the ego is only putting out 3.1V under load, so maybe as I said, they'll be better with a true 3.7 box.
Also, these are the mega 510 cartos. Drew at Nhaler recommends them, but they have a higher resistance atty inside and I disagree with his advice (although he is a GREAT vendor to deal with) I just think they need higher voltage to be good.
I may break down and try a different brand of carto with a lower resistance. Maybe that will change my mind.
I've found the megas are indeed much better @5-6v. They're 3.4ohm resistance so you're really struggling for production. 3.7v isn't *bad* per se, but it's just nowhere near as good as hitting it on 6v to me. Have to draw 3x as long and still the flavor lacks a little punch. 6v and I draw 1.5 sec get a full draw of vapor and plenty of taste. The prefilled ones don't knock my socks off but refilling with my liquids make it exactly what I want so I can be lazy and fill em once a day.
As far as the turning thing.. yeah, I've heard DO NOT DO THIS (or at least accept that you're risking breaking the coil OR causing your battery to short out, and on things like the eGo with no short protection, that's baaad) so I would never reccomend... despite having done it myself to tighten the draw.