Some of the tension setting is based on the blade manufacturer. Since I use blades made by the local saw sharpening shop, I follow their recommendations. Also, the tension will vary from saw to saw. My bandsaw is a 10" benchtop with shop made guides, so I tend to use the "pluck" method as well as the "deflection" method. The saw manufacturer stated "less than 1/8" deflection", but on full resaw capacity (7" on my saw), I will tension for less deflection. Slow feed is just important as tension on thick pieces. Practice with your own saw will teach you what is necessary for your particular setup and workpiece. I have a chart on the side of my saw that records what tension level is best for each width of blade I use on it. Yes, my little benchtop saw has a blade tension indicator on it, so it makes repeating saw setup quick and accurate.
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"Sawdust is Man Glitter"