Priming & Printing with .6 nozzle

Just switched to the Rapido .6 nozzle (changed extruder setting in config) and priming and printing is borked. Priming blob seems much smaller and doesnt stick to the bed, nozzle scrapes when starting print and print does not stick even slightly to the bed, most of the time it blobs around the nozzle. Had my .4 singing before this, please help