A few days ago I installed my E3D upgrade for my Ultimaker 2 and printed my first print with the supplied sample of E3D-Edge which turned out great, but as soon as I changed my nozzle and filament(Innofil3D PLA and DasFilament PLA), I started getting lots of issues with the filament not extruding and causing the Titan extruder to grind through the filament. I was able to get two successful prints done with the 0.8mm nozzle, but as soon as I started changing the nozzle again, I got issues regardless of the nozzle size. After rebuilding the hotend several times I wasn´t able to solve the issue but determine that the issue might be that the heatbrake isn´t working as intended, because the filament is sticking to the walls of the heatbreak and nozzle. Retraction is set to 2mm, so I don´t think that this is the cause for my problem. Can anyone confirm my theory that the heat transfer between the cooling block isn´t sufficient?