I've been practicing for my 6g test, but I'm having awful bad luck with my root. Just can't seem to find my sweet spot. Ran 6010 on 6in Sch. 80 in school at 82 amps, 1/8 in root face and gap, an never had any problems, but the Sch. 40 is kicking my butt. My keyhole gets way out of hand or i leave ho...