X-Lite Pinching Stick Ends 10mm and 15mm pinch area

There have been so many people saying that you cannot pinch with an X-Lite and there have been even more out there proving them wrong but one thing they all say is how nice it would be if the sticks were longer.
I looked on thingiverse and wasn't happy with the choices out there, granted the best size and length varies from person to person, I printed a 5,6,7,8 mm stick then closed my eyes and felt which size felt like it wasn't going to slip out of my hands or feel "wrong" the 7mm diameter one