Hello Ryan,
thank you for some point at this! I tried to contact reseller for making change in printhead to EEPROM.
I think this is the main problem..Because resolution is bigger, label is smaller. I cant set up any change in web management.. and we dont want use printhead converter..So I will wait for answer.. we of course tried Zebra ZT420 (200dpi) and this fixed everything but we bought many ZT420 300dpi models and we cant give them back. It too late. Any other help will be much appreciate.