Should not matter as long as its the same each time. In other words don't let the fat guy do one pull and the thin guy do the next pull. Always go out of your way to make each run the same. Check and adjust things like tire pressure and engine temperature.
The numbers don't really matter much its the difference from the stock pull to the modified pull. You should not compare dyno umbers with a different dyno.
P.S. I disagree with the standing over the bike as you can not properly work the controls and if needed for some emergency the rear brake would be hard to apply quickly. Not to mention a all gear run would be tough and they can help find a float level or starvation problem.
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