Hi, I have a gerber envision 375 and I have cut very thin vinyl with it and it works fine with that. But I want to make football helmet decals which has a 21 mil thick vinyl and I have the little blade stuck out as far as it will go and the force turned up all the way on my envision plotter. Does anyone know what the problem is? Do I need a new blade? I am unsure on what to do. Thanks!