I use vice grips on one end and the tube cutter on the other.
I don't agree that this is just a clear CE2, the tube is bigger and it seems to make a difference, at least for me. I try the CE2 out of the package and still can't get one to work so I end up putting them in tubes (NO PTB) and they perform perfect. I have never used PTB. I tried it but didn't see a noted difference in the wicking. More trouble for me than it's worth. JMO
I also use vice grips and don't care if the upper tube gets dented a little. I do wrap the carto in leather to lessen that and try not to over tighten.
I have to agree that performance improves simply by placing in the syringe. I also notice I 'mow' through juice a lot quicker. I know it's been discussed before but they do; don't know why. It's not the fact of seeing the juice level. I know that I only filled my stocks twice a day and these much, much more.
I do see 'Industrial's point too. While performance improves, I still get dry spots to where I have to tilt/roll the juice, especially when 3/4 empty. PTB would enhance performance like w/ stock cartos but these are different.