Just a suggestion based on my own experience.  Perhaps the low resistance carto's are contributing in part to your dislike of filler style.  I learned over time that I prefer a "cooler" vape.  My first tanks came included with Smoktech low resistance dual coil carto's.  And I continued to replace them with the same.  I didn't know any better at the time, but I just assumed that was all I should use in the tanks.
Well, like you I was not satisfied with them, but I did like carto tanks.  I looked around the forums and realized that a lot of people were using single coil cartos.  And I found the following chart 
Vaping Power Chart 2.0 - Imgur
I decided to switch to standard resistance.  So the combination of standard resistance, single coil cartos made a significant change of improvement for me.  Since the 2 ohm ce2 cartos were an improvement for you, I suggest the next time you purchase cartomizers that you get 2.0 ohm single carts.