Jeff, what helped me as much as anything is creating controlled test. Simple well know stuff that had no variables. Metal - Gauge - Tungsten - Filler - Gas Flow - Amperage. Fit up, prep, and clean meticulously so there's no doubt.
Then I use the baseline's Miller provides as reference.
Run a 1" bead at your baseline, then one inch beads at high and low extremes to the baseline and observe my habits during the tests and the results. Knowing the extremes has helped me understand right vs wrong and get the feel for normal or an acceptable average.
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