All of the cartomizers I have tried just give me a very intense throat hit, way to powerful, and not enjoyable. I use the PTB method which I found to be the best, I use it with my 510 atty's and my 801 atty's.
Very simple and effective, holds juice the longest, its all I use now after experimenting with fluval and the blue foam(plug,straw method).
Use the whole tea bag, cut it until you have rectangle, roll it up not real tight, I use a coffee straw, much easier to pull out when rolled up, then fold in half, insert open end into cart, now you will want the
folded end to be level with the top of cart so you will have to trim the end of tea bag. Now the most important part, where the fold is in the tea bag at the top of cart you want to cut a V notch big enough for the
atty to fit into and what it does when cart is installed, the atty will fit into the V and actually squeeze the tea bag around the atty. Also on my 801, bacause its deep I will place a small piece of blue foam in the bottom.
All I can say is has worked great for me, its the only method I use.