A couple of thoughts. First is heat vs. gap...tighter the gap, up the amps and visa versa. Find the right gap-amps,it's all about what feels right for you. I typically use nickel gap and nickel land on uphill and nickel land and two 1" banding straps tacked together for gap on downhillIf your undercutting on one side only, probably need to point the rod towards the undercut...very slightly of course. If undercut both sides, tighten up your gap or backoff on the heat to reduce key-hole size, or try adjusting rod angle closer to perpendicular. Like js55 said, when you get everything going right, you will get the "stack of dimes" root. Keep playing with the variables and it will suddenly all come together miraculously. Good Luck.