Also, have you tried Isaac's Fusions? I've read good things about them.
The 801 Fusion cartomizer is excellent and they are rated at 2.5Ω. Vast clouds of vapor, great on flavor and th is okay. These are one of my every day cartos and these are the ones that require the 801 to 510 or 901 adapter. (I told you wrong earlier - long day and I'm a little tired). Its difficult to make a Fusion "burn." These are very good!
The following is from 5cardstud on the Fusion:
3.2 volts--1.13 amps
Great vapor production, good taste and throat hit is also good.
3.7 volts--1.33 amps
The vapor production is amazing, It is great at this level as with the last 2 levels. Throat hit is great also as is the taste.
4.0 volts--1.45 amps
The vapor remains great, the throat hit is nice and mellow and the taste is wonderful.
4.2 volts--1.45 amps
The vapor still amazes me and the throat hit is warm. The taste is also great.
4.5 volts--1.62 amps
The vapor is still great, throat hit is really warm now but still vapable and the taste is still good although I'm pushing it.
The Fusion is also Don Da Boom's favorite carto and he has nice words for the duel-coil as well.
The Duel-Coil has 510 threads and are 1.5 ohm cartomizers. These work well with HV vaping. Although the effective resistance is 1.5-1.6 ohms, each coil is individually rated at 3.2ohm working in parallel. These are are most suitable on a 3.7v or higher PV to see their full potential.
I really like these on my Buzz at 4.5v but have had them up to 6.5v. The immense clouds of vapor are something you've only dreamed of. Right now I have some CreamSoda from FSUSA that I bought last year and really didn't care much for. In the duel-coil its a new experience and a new flavor and I just can't put it down.
The duel-coils are also difficult, if not impossible to burn.
My other cartos are the IKV Mega-808 and the FSUSA 510. Both of these are very good cartos. The FSUSA 510 is still what I measure all other cartos against. These deliver some of the best flavor, a satisfactory cloud of vapor and good th.
The duel-coil cartos are not recommended for use on the eGo. The people who make the eGo do not recommend using anything below 2 ohms on the eGo batts. Also, the eGo does not deliver 3.7v like most other units, they put out 3.1v (+ -).
I started vaping one year ago and have tried nearly every carto and some drip atty's and have settled on these four being the cartos I prefer to use. For me, dripping is too much of a hassle and the Fusion and Duel-Coil deliver nearly equal vapor, flavor and th.