My hot end is kraken, but I think v5 and v6 are all similar. My kraken works great with PETG and HIPS, but always jams with PLA and PVA. I tried every method found here, and the only way helps is seasoning, but it dosen't last for long. So I just add a contineous oiler before the extruder. It won't compromise filament bite of extruder gear teeth, and can lubricate all the way from tube to nozzle. I don't have any jamming after this setup for 1 week, now I can print with PLA + PVA.