Have you tried using the steel cannulas? I think they're called Rapid-D for the Accu-chek pumps and for my daughter's Animas pump they're called Contact-Detach. Our concern before pumping was the risk of teflon cannulas kinking and causing problems which is why our DSN suggested the steel cannula as it's almost impossible for it to kink. The sticky adhesive holds the steel cannula in place very well. I'm not sure what you mean by the cannula not being in properly, perhaps you can explain further or do you mean there's been a problem like kinking when it's gone in without you being aware?